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Prove or disprove the following identity

sin^4theta - cos^4theta = sin^2theta-cose^2theta

LS = sin^4 Ø - cos^4 Ø

= (sin^2 Ø + cos^2 Ø)(sin^2 Ø - cos^2 Ø)
= (1)(sin^2 Ø - cos^2 Ø)
= RS

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