Express a trig equation in terms of $k$ The acute angle $x$ radians is such that $\tan x$ = $k$, where $k$ is a positive integer. Express in terms of $k$.
i) $\tan (\pi - x)$
ii) $\tan (\frac{1}{2}\pi - x )$
iii) $\sin x$
I don't understand what the question is stating or asking. I got the answer $\tan \pi - k$ for the first one but that is wrong :(
Edit: Correct answer for the first one is $\tan(\pi - x) = -k$, I don't know how to get there.

Hint:  Use $\tan (\alpha +\beta)=\dfrac{\tan\alpha+\tan\beta}{1-\tan\alpha\tan\beta}$.
