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OpenStudy (anonymous):
prov that sin3A=?
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OpenStudy (hba):
This is not a proof ?
OpenStudy (hba):
sin3A= something which we have to prove ?
OpenStudy (hba):
@mustry Please reply ?
OpenStudy (ajprincess):
Prove sin3A=? sin3A=sin(A+2A) use sin(A+B)=sinAcosB+cosAsinB sin2A=2sinAcosA
OpenStudy (anonymous):
good
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OpenStudy (anonymous):
actually u know
OpenStudy (anonymous):
no ur suppose to expand it
OpenStudy (anonymous):
sin(2A+A)=sin2AcosA+cos2AsinA
OpenStudy (anonymous):
BUT cos2A=cos^A+sin^A
OpenStudy (ajprincess):
cos2A=cos^2A-sin^2A =1-2sin^2A =2cos^2A-1
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OpenStudy (anonymous):
OKAY put it in the equestn
OpenStudy (anonymous):
ur r8
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