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证明:sin^4t+cos^4t=1-2sin^2tcos^2t
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证明:sin^4t+cos^4t=1-2sin^2tcos^2t
▼优质解答
答案和解析
左=sin^4t+cos^4t
=(sin^2t+cos^2t)^2-2sin^2t·cos^2t
=1-2sin^2t·cos^2t
=右
=(sin^2t+cos^2t)^2-2sin^2t·cos^2t
=1-2sin^2t·cos^2t
=右
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