Answer:

Explanation:
Since θ is in the first quadrant, sinθ and cosθ are both positive.

We know the following identity to find tan 2θ:

First, let's find tan 2θ using the information given:

We already know that :

To find, cosθ we can use the Pythagorean identity:






Now, we can find tan θ.

Now, we can use tan θ to find tan 2θ using the double-angle formula:

So,
