(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

cos([tex]\pi[/tex]-x)= -cosX

the formula is cos(A-b) = cosAcosB+sinAsinB

so i sub in the given to get..

cos[tex]\pi[/tex]cosx + sin[tex]\pi[/tex]sinX

then where do i go from there? im new to math like this, its a much higher level than what im used to, any help would be very apprieciated. thanks.

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Compounded Angle Identities

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