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OpenStudy (anonymous):
2sin 4thetacos4theta
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OpenStudy (lynfran):
u have to simplify this?
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
using double angle formula
OpenStudy (lynfran):
ok the double angle identity for sin is \[\sin2A=2sinAcosA\]
OpenStudy (lynfran):
so \[\sin8A=2\sin4Acos4A\]
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OpenStudy (lynfran):
just replace A"" with theta
OpenStudy (anonymous):
thanks!
OpenStudy (lynfran):
welcome
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