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" 28) "cos^(6)A-cos^(2)A=sin^(4)A-sin^(2...

" 28) "cos^(6)A-cos^(2)A=sin^(4)A-sin^(2)A

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cos^(6)A+sin^(6)A=1-3/4sin^(2)(2A)

cos^(6)A+sin^(6)A=1-3/4sin^(2)(2A)

Prove that cos^(4)A-sin^(4)A=cos^(2)A-sin^(2)A .

sin^(6)A + cos^(6)A + 3sin^(2)A.cos^(2)A=

Prove that: cos^(6)A-sin^(6)A=cos2A(1-(1)/(4)sin^(2)2A)

If sin A+sin^(2)A+sin^(3)A=1, then find the value of cos^(6)A-4cos^(4)A+8cos^(2)A

cos^6A-sin^6A=cos2A(1-1/4sin^2 2A)

If sin A + sin^(2)A + sin^(3)A =1 , then , prove that cos^(6) A - 4 cos^(4) A + 8 cos^(2) A =4 .

Prove that : (sin A+cos A)/(sin A-cos A)+(sin A-cos A)/(sin A+cos A)=(2)/(sin^(2)-cos^(2)A)