Cos⁴Q+sin⁴Q-2sin²Qcos²Q=(2cos²Q-1)²
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Step-by-step explanation:
cos⁴Q + sin⁴Q -2sin²Qcos²Q
(cos²Q-sin²Q)² = ( cis²Q -(1-cos²Q) )
(2cis²Q - 1)²
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