简化三角函数:csc(x)/sin(x)-(cot(x)csc(x))/sec(x)

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简化三角函数:csc(x)/sin(x)-(cot(x)csc(x))/sec(x)简化三角函数:csc(x)/sin(x)-(cot(x)csc(x))/sec(x)简化三角函数:csc(x)/si

简化三角函数:csc(x)/sin(x)-(cot(x)csc(x))/sec(x)
简化三角函数:csc(x)/sin(x)-(cot(x)csc(x))/sec(x)

简化三角函数:csc(x)/sin(x)-(cot(x)csc(x))/sec(x)
csc(x)/sin(x)-(cot(x)csc(x))/sec(x)
=1/sin²(x) - sin(x)/cos(x) * 1/sin(x) * cos(x)
=1/sin²(x) -1
=(1-sin²(x))/sin²(x)
=cos²(x)/sin²(x)
=cot²(x)
哪一步不明白,可以追问!