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Introduction to Trigonometry

CBSE 2026 Board Exam Set 1 (Code 30/7/1)

CBSE_BOARD_PYQ_2026_30_7_1

Grade 10

Question:

[Section A]

If $\tan \theta = \dfrac{3}{4}$, then $\cos \theta$ is equal to:

(A) $3/5$
(B) $4/5$
(C) $4/3$
(D) $5/4$

Step-by-Step Solution

Key Concept: $\tan \theta = 3/4 \Rightarrow \text{Hypotenuse} = \sqrt{3^2 + 4^2} = 5$. Thus $\cos \theta = 4/5$.

Sol. (B) $4/5$. [1.0 Mark]

Correct Answer: (B) $4/5$

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