Question

: Prove cos^4 − cos^2 = sin^4 − sin^2 A

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

Sin^2+ cos^ 2×cos^2

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

sin^2+cos^2-sin^2×cos^2

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

sin^2×sin^2+cos^2

sin^4+cos^2

hence prove

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