inverse trig question (1 Viewer)

[Hermes1]

\cos^{-1}x-\sin^{-1}x = k

show that:
x = \frac{1}{\sqrt{2}}(\cos \frac{k}{2}-\sin \frac{k}{2})

-pi/2 to 3pi/2 inclusive

 

[Hermes1]

what am i doing wrong with latex.how do i put it into that form do i put brackets or something around it.

 

[deterministic]

[tex.]\cos^{-1}x-\sin^{-1}x = k[/tex.] but without the dots
As for the question


Result follows

 

[Hermes1]

tnx for the help with the question and latex.