Hi guys,

How would one prove the following trigonometric identity.

sinθ(1 + tanθ) + cosθ(1 + cotθ) = sinθ+cosθ / sinθcosθ

Also, how would one find the value of cosθ and also cos(2θ) if sinθ = 3/5 and Pi/2 < θ < pi

Thanks in advance for any help .