Introduction to Trigonometry
CH08 Question Bank
CBSE_CH08_QUESTION_BANK
Grade 10
Question:
If $\sec A = 2$, find the value of $A$ and hence evaluate $\dfrac{1}{\tan A}$.
Step-by-Step Solution
Key Concept: Recall the standard angle for which secant equals 2.
$\sec A=2\Rightarrow \cos A=\dfrac12 \Rightarrow A=60^\circ$. [1.0 Mark]
$\dfrac{1}{\tan A}=\cot60^\circ=\dfrac{1}{\sqrt3}$. [1.0 Mark]
Correct Answer:
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