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OpenStudy (anonymous):
find the solution- cosxcos2xcos3x=1/4
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OpenStudy (anonymous):
@mukushla
OpenStudy (anonymous):
emm maybe writing\[\cos x\cos 3x\]formula will help
OpenStudy (anonymous):
\[\cos a \cos b=?\]
OpenStudy (anonymous):
2cosacosb ??
OpenStudy (anonymous):
=cos(a+b)+cos(a-b)
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OpenStudy (anonymous):
oops that will not help ??
OpenStudy (anonymous):
lol
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