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OpenStudy (anonymous):
Please help!! Simplify the expression by using a double angle formula cos^2(40) - sin^2(40)
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OpenStudy (anonymous):
this can be written as cos(80)
OpenStudy (anonymous):
did u get it @ariabstr
OpenStudy (anonymous):
I dont know how to answer it now
OpenStudy (anonymous):
would it be \[\sin \frac{ \pi }{ 18 } - \cos \frac{ \pi }{ 18 }\]
OpenStudy (anonymous):
@KissMyAxe
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OpenStudy (er.mohd.amir):
cos^2 x-sin^2 x=cos 2x
OpenStudy (anonymous):
@Er.Mohd.AMIR has explained it!
OpenStudy (er.mohd.amir):
its formula
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