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OpenStudy (anonymous):
rewrite cos 3x with only sinx and cosx
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OpenStudy (welshfella):
Hint:- cos 3x = cos (2x + x)
OpenStudy (welshfella):
use the identity cos (a + b) = cos a cos b - sin a sin b
OpenStudy (welshfella):
put a = 2x and b = x
OpenStudy (welshfella):
i'll start it off for you cos 3x = cos (2x + x) = cos 2x cos x - can you finish it off?
OpenStudy (anonymous):
\[\cos (A \pm B)=cosAcosB \mp\ sinAsinB\]
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