y=sin^2x+2sinxcosx-3cos^2x·······晕了 又会做了 - -
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y=sin^2x+2sinxcosx-3cos^2x·······晕了又会做了--y=sin^2x+2sinxcosx-3cos^2x·······晕了又会做了--y=sin^2x+2sinxcosx
y=sin^2x+2sinxcosx-3cos^2x·······晕了 又会做了 - -
y=sin^2x+2sinxcosx-3cos^2x
·······晕了 又会做了 - -
y=sin^2x+2sinxcosx-3cos^2x·······晕了 又会做了 - -
你要求什么呢?怎么没有问题?
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