Prove
Sin^4 theta+Cos4 theta- Sin^2 theta Cos^2 theta=1-3 Sin^2 theta Cos^2 theta
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LHS
sin⁴theta+cos⁴theta-sin²theta cos²theta
=(sin²theta)²+(cos²theta)²-sin²theta cos²theta
=(sin²theta+cos²theta)-2sin²theta cos²theta-sin²theta cos²theta
=1-3sin²theta cos²thets
LHS=RHS(proved)
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