Differentiability Questions (1063)

If $y = \tan^{-1}\!\!\sqrt{\dfrac{1+\sin x}{1-\sin x}}$, $x\in\!\left(0,\dfrac{\pi}{2}\right)$, then $\dfrac{dy}{dx}$:

Let f (x) be a real differentiable function such that f (0) = 1 and f (x + y) = f (x)f (y) + f (x)f (y) for all ′ ′ x, y \in R . Then \sum 100 n=1 log e f (n) is equal to :

882. Let \(f(x) = \begin{cases} \dfrac{ax^3 + bx^2 + cx + d}{x}, & x \neq 0 \\ 2, & x = 0 \end{cases}\) be a continuous function where \(a, b, c, d\) are in arithmetic progression. Then find the number of points where \(|f(|x|)|\) is non derivable.

Let f : R$\to$R be a twice differentiable function such that (sin x cos y)(f$(2x + 2y) - f$$(2x - 2y)) = (cos$x sin y)(f$(2x + 2y) + f$$(2x - 2y))$, for all x, y$\ in $R. If f (0) = ′ 1 2 , then the value of 24f ′′ ( 5$\pi$3 ) is:

\(\lim_{x \to \infty} \left(\frac{3x-4}{3x+2}\right)^{\frac{x+1}{3}} =\) ______

If \(\lim_{x \to 2} \dfrac{\tan(x-2)\{x^2 + (k-2)x - 2k\}}{x^2 - 4x + 4} = 5\), then \(k\) is equal to

A circular disk of unit radius is filled with a number of smaller circular disks arranged in the form of hexagon. Let \(A_n\) denotes a stack of disks arranged in the shape of a hexagon having \(n\) disks on a side. If \(A\) be the area of large disk, \(S_n\) be the number of disks in \(A_n\) configuration and \(r_n\) be the radius of each disk in \(A_n\) configuration, then find \(\lim_{n \to \infty} \frac{S_n}{n^2}\)

If $y = \sum_{k=1}^{6} k\cos^{-1}\!\left\{\dfrac{3}{5}\cos kx - \dfrac{4}{5}\sin kx\right\}$, then $\dfrac{dy}{dx}$ at $x=0$ is: [Integer type]

If $y = (x^2+1)^{55}$, then $\dfrac{d^{55}}{dx^{55}}\!\big[(x^2+1)^{55}\big]_{x=1}$ equals $N\cdot55!$, find $N$. [Integer type; answer 2890]

If $\left(a+\sqrt{2}\,b\cos x\right)\!\left(a-\sqrt{2}\,b\cos y\right)=a^2-b^2$, where $a>b>0$, then $\dfrac{dx}{dy}$ at $\!\left(\dfrac{\pi}{4},\dfrac{\pi}{4}\right)$ is: [If answer expressed as $(a+b)/(a-b)$, find $(a+b)^2$ when $a=5,b=2$]

A circular disk of unit radius is filled with a number of smaller circular disks arranged in the form of hexagon. Let \(A_n\) denotes a stack of disks arranged in the shape of a hexagon having \(n\) disks on a side. If \(A\) be the area of large disk, \(S_n\) be the number of disks in \(A_n\) configuration and \(r_n\) be the radius of each disk in \(A_n\) configuration, then find \(\lim_{n \to \infty} n r_n\)

Let \(x_n\) be positive root of the equation \(x^n = x^2 + x + 1\). Then the value of \(e^{\left(\lim\limits_{n\to\infty} n(x_n - 1)\right)}\) is:

Twice differentiable f. Find \((k_1,k_2)\).

Let \(f(x) = \displaystyle\int_0^x t\ln(1+t^2)\, dt\), then \(f''(0)\) is:

If \(f(x)\) is continuous at \(x = 0\) and \(\lim_{x \to 0} f(x) = e^{\lim_{x \to 0^2} ab\left(\sin\left(\frac{2x^2}{a}\right) + \cos\left(\frac{3x}{b}\right) - 1\right)} = f(0) = e^3\), then the minimum value of \(a\) for which \(b\) is real is:

The limit limx→∞ (x+1)10+(x+2)10+···+(x+100)10 x10+1010 is:

Let f(x) = sin{x} x2+ax+b. If f(5+) and f(3+) exist finitely and are non-zero, find (a + b):

Let \(f(x)\) be differentiable function on the interval \((0, \infty)\) such that \(f(1) = 1\) and \(\lim_{t \to x} \frac{t^3 f(x) - x^3 f(t)}{t^2 - x^2} = \frac{1}{2}\) for all \(x > 0\), then \(f(x)\) is:

Let $\alpha,\beta\in\mathbb{R}$ be such that the function $f(x)=\begin{cases}2\alpha(x^2-2)+2\beta x & x<1\\(\alpha+3)x+(\alpha-\beta) & x\geq1\end{cases}$ be differentiable at all $x\in\mathbb{R}$. Then $34(\alpha+\beta)$ is equal to

The value of limx→0  tan π 4 + x
1/x is:

\(f(x)=\begin{cases}a+\sin(\sin x) & x\ge 0\\ \ln(\cos x)+bx & x differentiable at \(x=0\). Then:

If $f(x) = \begin{cases} x+1; & x > 1 \\ 0; & x = 1 \text{ then } f'(0) \text{ equals to} \\ -3x; & x < 1 \end{cases}$

Let $[x]$ denote the greatest integer function, and let $m$ and $n$ respectively be the numbers of points, where the function $f(x) = [x] + |x-2|$, $-2 < x < 3$, is not continuous and not differentiable. Then $m + n$ is equal to:

The value of $\lim_{x \to 0} \frac{\sin(2x + \tan 2x)}{x^3}$ is equal to

Let $[x]$ denote the greatest integer function and $f(x)=\max\{1+x+[x],\ 2+x,\ x+2[x]\}$, $0\leq x\leq 2$, where $m$ is the number of points where $f$ is not continuous and $n$ be the number of points in $(0,2)$ where $f$ is not differentiable. Then $(m+n)^2+2$ is equal to

Let x = 2 be a root of the equation x^2 + px + q = 0 and f(x) = \begin{cases} \dfrac{1-\cos(x^2-4px+q^2+8q+16)}{(x-2p)^4}, & x \neq 2p \\ 0, & x = 2p \end{cases}. Then \lim_{x \to 2p^+} [f(x)], where [.] denotes greatest integer function, is

If $\lim_{x \to \infty} \left(1 + p^2 + q^2(x)\right) = e^p$, then

If $f(x) = (x-1)(x-2)(x-3)(x-4)(x-5)$, then the value of $f'(5)$ is equal to

If limx→0[1 + x ln(1 + b2)]1/x = 2b sin2 θ, b > 0 and θ ∈(−π, π], then the value of θ is:

If limx→1 x4−1 x−1 = limx→k x3−k3 x2−k2 , then k is:

Same \(f(x)=\text{tgn}(x)\cdot\sin(x)\cdot|x|\). Points of non-differentiability in \([-10,10]\):

If constants \(a\), \(b\) and \(c\) so that \(\lim_{x\to 0}\dfrac{axe^x - b\log(1+x) + cxe^{-x}}{x^2\sin x} = 2\) then find \((a+b-c)/8\).

$\displaystyle\lim_{x\to0}\left(\dfrac{1-\cos^2(3x)}{\cos^3(4x)}\right)\left(\dfrac{\sin^3(4x)}{(\ln(2x+1))^5}\right)$ is equal to

\(f(x)=\begin{cases}e^{x^2}+x^3+1 & x>0\\ ax^2+bx+2 & x\le 0\end{cases}\) is differentiable at \(x=0\). Then:

The value of limx→0 ln(sin 3x) ln(sin x) is:

The value of $\lim_{x \to 0} \frac{1-\cos(\tan x)}{x^2 \sin(2\sin(x)\cdot \cos(\frac{1}{x}))}$ is equal to

\(f(x)=\begin{cases}\sin^{-1}x+a\cos\pi x & -1 is differentiable in \((-1,1)\). Find \(2a+b\).

Define $f: [0, \pi] \to \mathbb{R}$ by $f(x) = \begin{cases} \tan^2 x + \sqrt{2\sin^2 x + 3\sin x + 4 - \sqrt{\sin^2 x + 6\sin x + 2}} & x \neq \pi/2 \\ k & x = \pi/2 \end{cases}$ is continuous at $x = \pi/2$, then $k$ is equal to:

If \[\lim_{x \to 0} \frac{x(1 + a\cos x) - b\sin x}{x^3} = 1\] then

If $x^2 + y^2$ and $z = x + 3t, y = 2x - t$, then $\frac{dz}{dy}$ is equal to (where $t$ is a constant)

Let f, g and h be the real valued functions defined on \mathbb{R} as f(x) = \begin{cases} \frac{x}{|x|}, & x \neq 0 \\ 1, & x = 0 \end{cases}, g(x) = \begin{cases} \frac{\sin(x+1)}{(x+1)}, & x \neq -1 \\ 1, & x = -1 \end{cases} and h(x) = 2[x] - f(x), where [x] is the greatest integer \leq x. Then the value of \lim_{x \to 1} g(h(x-1)) is

If $f(x) = \begin{cases} \frac{\sqrt{a+x}-\sqrt{a-x}}{x} & -1 \leq x < 0 \\ \frac{3x+2}{x-3} & 0 \leq x \leq 1 \end{cases}$ is continuous in $[-1, 1]$, then the value of $a$ is

If \(f(x)\) is odd linear polynomial with \(f(1) = 1\), then \[\lim_{x \to 0} \frac{2^{f(\tan x)} - 2^{f(\sin x)}}{x^2 f(\sin x)}\] is

Let $f(x)=\begin{cases}x^2\sin\left(\dfrac{1}{x}\right), & x\neq0\\0, & x=0\end{cases}$. Then at $x=0$:

Let f(x) = ( 1 + 2x a 0 ≤x

If $\displaystyle\lim_{x\to0}\frac{e^{(a-1)x}+2\cos bx+(c-2)e^{-x}}{x\cos z-\log_e(1+z)}=2$, then $a^2+b^2+c^2$ is equal to:

Which of the following limits equal 1/2?

Given, $\lim_{x \to \infty} \frac{2x + 3^{x+1}}{(2x+3)^2 + (2x+4)^3}$

If $y = \log_a 2 + \log_c 10 + \log_c 10 + \log_{10} 10$, then $\frac{dy}{dx}$ is equal to

If limx→a 2x− √ x2+3a2 √x+a− √ 2a = √ 2 (where a ∈R+), then a is equal to: