# Math Help - Writing f(z) in its real and complex parts.

1. ## Writing f(z) in its real and complex parts.

I need help rewriting f(z) as f(z)=u+iv. In particular I need help with sin(z^2) and sec(z).

I believe Sec(z) would just be Sec(x)Sech(y)+i(-Csc(x)Csch(y)). Or just the inverse of cos(z)

However I cannot find a way to relate Sin(z) to Sin(z^2).

3. $\sin(z^2)=\sin(x^2-y^2)\cosh(2xy)+i~\cos(x^2-y^2)\sinh(2xy)$