化简(sin^2x/sinx-cosx) -(sinx +cosx/tan^2x-1)
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化简(sin^2x/sinx-cosx) -(sinx +cosx/tan^2x-1)
化简(sin^2x/sinx-cosx) -(sinx +cosx/tan^2x-1)
化简(sin^2x/sinx-cosx) -(sinx +cosx/tan^2x-1)
[sin²x/(sinx-cosx]-[(sinx+cosx)/(tan²x-1)]
=[sin²x/(sinx-cosx)]-[(sinx+cosx)cos²x/(sin²x-cos²x)]
=[sin²x/(sinx-cosx)]-[cos²x/(sinx-cosx)]
=(sin²x-cos²x)/(sinx-cosx)
=sinx+cosx;
我根本看不懂你写的什么
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