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

[" 17."cos^(4)A+sin^(4)A+2sin^(2)A cos^(2)A=1],[" 18."sin^(4)A-cos^(4)A=2sin^(2)A-1=1-2cos^(2)A=sin^(2)A-cos^(2)A],[" 19."cos^(4)A-sin^(4)A=2cos^(2)A-1]

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

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

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

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

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

cos^(4)A-sin^(4)A is equal to 2cos^(2)A+1(b)2cos^(2)A-1(c)2sin^(2)A-1( d) 2sin^(2)A+1

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

if cos A+cos^(2)A=1 , then sin^(2)A+sin^(4)A=1

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

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