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" 23."cos^(6)A-sin^(6)A=cos2A(1-(1)/(4)s...

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

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

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

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

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^6 theta-sin^6theta=cos2theta(1-1/4 sin^2 2 theta)

cos^(2)(sin^(-1)(1/6))+sin^(2)(cos^(-1)(1/2))

Prove that sin^(6)theta+cos^(6)theta=1-(3)/(4)sin^(2)2 theta

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

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