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[" 7.Prove that: "sin3A cos^(3)A+cos3A s...

[" 7.Prove that: "sin3A cos^(3)A+cos3A sin^(3)A=(3)/(4)sin4A" ."],[" 8.Prove that: "]

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Prove that : cos^(3)A cos3A+sin^(3)A sin3A=cos^(3)2A

Prove that sin 4A=4 sin A cos^(3) A-4 cos A sin^(3) A

Prove that: "sin" 4A=4 sin A cos^(3)A-4 cos A "sin"^(3)A .

Prove that: (cos^(3)A-cos3A)/(cosA)+(sin^(3)A+sin3A)/(sinA)=3

Prove that: (cos^(3)A-cos3A)/(cosA)+(sin^(3)A+sin3A)/(sinA)=3

Prove that : sin 4A=4 sinA cos^3 A- 4 cosA sin^3 A .

Prove that (sin A+cos A)(1-sin A cos A)=sin^(3)A+cos^(3)A

Prove that: sin theta cos^(3)theta-cos theta sin^(3)theta=(1)/(4)sin4 theta

Prove that sin4x = 4sinx cos^3x - 4cosx sin^3x

Prove that: (sin A+sin3A)/(cos A-cos3A)=cotA