求证:tanx^2-sinx^2=tanx^2sinx^2
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求证:tanx^2-sinx^2=tanx^2sinx^2
求证:tanx^2-sinx^2=tanx^2sinx^2
求证:tanx^2-sinx^2=tanx^2sinx^2
左边=sin²x/cos²x-sin²x
=sin²x(1/cos²x-1)
=sin²x(1-cos²x)/cos²x
=sin²x*sin²x/cos²x
=sin²xtan²x=右边
命题得证
求证:tanx^2-sinx^2=tanx^2sinx^2
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