Answer:
Option 4
Step-by-step explanation:
By the Pythagorean identity, and the fact we are in the first quadrant,
[tex]\cos \theta=\frac{4}{5}[/tex]
Using the double angle formula for cosine,
[tex]\cos 2\theta=2\cos^{2} \theta-1=2\left(\frac{4}{5} \right)^2 -1=\frac{7}{25}[/tex]
