" 19."cos^(4)A-sin^(4)A=2cos^(2)A-1

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

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

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

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

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

What is ( cos ^(4) A - sin ^(4) A)/( cos ^(2) A - sin ^(2) A) equal to ?

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

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

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