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Some Applications of Trigonometry
Question
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If sin θ = cos θ, then write the value of θ. 0°<θ<90°.

Answer

sin θ = cos θ
⇒ cos (90-θ) = cos θ
⇒90-θ = θ
⇒2θ = 90 ⇒ θ = 45°.

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Some More Questions From Some Applications of Trigonometry Chapter

Choose the correct option and justify your choice:
sin 2A = 2 sin A is true when A = 
(A) 0°         (B) 30°         (C) 45°       (D) 60°