Question

Double and half angle identities?

Answer 1

Answer:

Option 4

Step-by-step explanation:

Given:

Sinθ = $\frac{15}{17}$

Since, cos2θ = 1 - 2sin²θ

cos2θ = $1-2(\frac{15}{17})^2$

cos2θ = 1 - $\frac{450}{289}$

cos2θ = $\frac{289-450}{289}$

cos2θ = $-\frac{161}{289}$

Therefore, Option 4 will be the answer.