Asked by Rony

the expression cos4x cos3x + sin4x sin3x is equivalent to
which one of the following is the answer:
1) sinx
2) sin7x
3) cosx
4) cos7x
Answered by drwls
Look up the equation for cos(x-y) and it should be obvious what the answer is.

Think of x as 4x and y as 3x.

http://www.csgnetwork.com/trigtriformulatables.html
Answered by Rony
it is cosx
thanks
Answered by Dewesh kumar
Seca=4x + 1/x than secb + tana what please tell me after 2days
Answered by xdfh
fdgxdf
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