If
and $(A + B)^2 = A^2 + B^2$ then $x + y$ is:
If \[ \sin x + \cos x = \frac{1}{5} \] then \( \tan 2x \) is:
The area of the region bounded by the ellipse $$\frac{x^2}{16} + \frac{y^2}{9} = 1$$ is: