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" 17."cos^(4)A+sin^(4)A+2sin^(2)A cos^(2...

" 17."cos^(4)A+sin^(4)A+2sin^(2)A cos^(2)A=1

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cos^(4)A-sin^(4)A=2cos^(2)A-1

cos^(4)A-sin^(4)A=2cos^(2)A-1

Prove the following identities: sin^(4)A+cos^(4)A=1-2sin^(2)A cos^(2)A

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

sin^(4)x+cos^(4)x=1-2sin^(2)x cos^(2)x

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

Prove the following identities: sin^(4)A-cos^(4)A=sin^(2)A-cos^(2)A=2sin^(2)A-1=1-2cos^(2)A

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

Prove that sec^(2)A-((sin^(2)A-2sin^(4)A)/(2cos^(4)A-cos^(2)A))=1

If (cos^(4)A)/(cos^(2)B)+(sin^(4)A)/(sin^(2)B)=1, Prove that: sin^(4)A+sin^(4)B=2sin^(2)A sin^(2)B