Question

Pls look at pic before help out confused

Answer 1

Option 4

Explanation:

By the Pythagorean identity, and the fact we are in the first quadrant,

`\cos \theta=(4)/(5)`

Using the double angle formula for cosine,

`\cos 2\theta=2\cos^(2) \theta-1=2\left((4)/(5) \right)^2 -1=(7)/(25)`