If and then is equal to | CGP Edu

Maths Trigonometrical Ratios, Functions and Identities Trigonometrical Ratios of Multiple and Sub-Multiple Angles Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

If and then is equal to

A

B

C

D

Text Solution

Verified by Experts

The correct answer is:

Given that ….(i)

and ….(ii)

Squaring,

and

Adding, 2+ 2

⇒ ⇒ ⇒ ⇒

⇒ ⇒

⇒ ⇒

⇒ ⇒

Trick : Put , then

∴ ∴ , which is given by and .

Again putting , we get

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