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OpenStudy (brydenwright):
Use the angle addition formula to find the expression for cos (a+b). What happens if you change it to cos(a+a)
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OpenStudy (legomyego180):
Heres a hint: \[Cos(a+a)=Cos(2a)\]
TheSmartOne (thesmartone):
Hint: cos(A+B) = cosAcosB − sinAsinB
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