Math Help - Express in real and imaginary parts

1. Express in real and imaginary parts

I am having trouble with this question i just dont know where to start, im not looking for a straight up answer just hints to help me on my way to solving it myself.

Express the following complex number in real and imaginary parts;

z = 1 / cos^2(0.5*j*ln(j))

2. Re: Express in real and imaginary parts

$\ln z=\ln |z|+i\arg z\Rightarrow \ln i=\cdots$

Should be straightforward from there.