# Trig Identities help?

Which expression is equivalent to (1 - 2sin^2 θ)

a) cos^2 θ

b) 2cos^2 θ - 1

c) 1 - 2cos^2 θ

d) sin^2 θ

WILL AWARD BEST ANSWER!!!

Thanks so much, please show work.

Update:

work not required**

### 1 Answer

Relevance

- JohnathanLv 75 months ago
1 - 2 sin^2(theta)

= (1 - sin^2(theta)) - sin^2(theta)

= cos^2(theta) - sin^2(theta)

= cos^2(theta) - (1 - cos^2(theta))

= 2 cos^2(theta) - 1. B).

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