cos^4 theta + sin^4 theta -2sin^2 theta cos^2 theta
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cos^4 theta + sin^4 theta +2sin^2 theta cos^2 theta
= cos^4 theta + sin^4 theta +2 × sin^2 theta × cos^2 theta
=(cos^2 theta + sin^2 theta)^2
= 1^2
= 1 is the rut ANSWER
= cos^4 theta + sin^4 theta +2 × sin^2 theta × cos^2 theta
=(cos^2 theta + sin^2 theta)^2
= 1^2
= 1 is the rut ANSWER
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