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OpenStudy (anonymous):
If sinA=3/5, find sin4A (Dealing with half and double angle formulas)
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OpenStudy (shamim):
sin4A=2*sin2A*cos2A=2*2*sinA*cosA*(cos^2A-sin^2A)
OpenStudy (anonymous):
if sinA=3/5 then first find cosA ? and proceed futher..(alterantely u can find cos2A using cos2A=1-2sin^2A and then cos4A using cos4A= 2cos^2(2A) -1 and then fin sin4A)
OpenStudy (shamim):
r u able to find out the value of cosA when sinA=3/5
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