用cosα表示sin^4α-sin^2α+cos^α
人气:449 ℃ 时间:2020-06-18 04:19:54
解答
sin^4α-sin^2α+cos^2α
=sin^2a(sin^2a-1)+cos^2a
=(1-cos^2a)(-cos^2a)+cos^2a
=-cos^2a+cos^4a+cos^2a
=cos^4a
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