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

#### mbrez2

cos(cos-13/4+tan-13)

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

#### chiro

MHF Helper
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
Re: Enter the exact answer as a single fraction. Rationalize the denominator, if requ

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

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