sin^2-cos^2等于啥
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等于1-2cos^2或者2sin^2-1。
sina^2+cos^2=1,
sin^2-cos^2
=(1-cos^2)-cos^2
=1-2cos^2
或sin^2-cos^2
=sin^2-(1-sin^2)
=sin^2-1+sin^2
=2sin^2-1
sina^2+cos^2=1,
sin^2-cos^2
=(1-cos^2)-cos^2
=1-2cos^2
或sin^2-cos^2
=sin^2-(1-sin^2)
=sin^2-1+sin^2
=2sin^2-1
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