原式=tan²θ-sin²θtan²θ+cot²θ-cot²θcos²θ
=(1-sin²θ)tan²θ+(1-cos²θ)cot²θ
=cos²θtan²θ+sin²θcot²θ
=sin²θ+cos²θ
tan²θ+cot²θ-sin²θtan²θ-cos²θcot&sup
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