由 sinx+sin^2x=1
得 sinx=1-sin^2x=cos^2x
cos^2x+cos^4x
=cos^2x(1+cos^2x)
=sinx(1+sinx)
=sinx+sin^2x
=1
若sinx+sin^2x=1,则cos^2x+cos^4x=?
若sinx+sin^2x=1,则cos^2x+cos^4x=?
数学人气：639 ℃时间：2020-02-28 03:30:16
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