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Simply (sin75^(@)-sin15^(@))/(cos75^(@)+cos15^(@)) Prove that (a)(sin3A+sinA)SinA+(Cos3A-cosA)cosA=0 (b)cos20^(@)cos50^(@)cos60^(@)=(1)/(16) (c) (sin8thetacostheta-sin6 thetacos 3 theta)/(cos 2 theta cos theta-sin 3 thetasin4 theta)=tan 2 theta |
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