Enter the exact answer as a single fraction. Rationalize the denominator, if required

Jan 2016
7
0
USA
cos(cos-13/4+tan-13)

Enter the exact answer as a single fraction. Rationalize the denominator, if required
 

chiro

MHF Helper
Sep 2012
6,608
1,263
Australia
Re: Enter the exact answer as a single fraction. Rationalize the denominator, if requ

Hey mbrez2.

Hint - I would consider a right angled triangle with appropriate sides.
 

skeeter

MHF Helper
Jun 2008
16,217
6,765
North Texas
Re: Enter the exact answer as a single fraction. Rationalize the denominator, if requ

you may also need the sum identity for cosine ...

$\cos(\alpha+\beta)=\cos{\alpha}\cos{\beta} - \sin{\alpha}\sin{\beta}$