cscx-cotx等于什么?
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使用三角函数的定义和恒等式可以计算csc(x)-cot(x)的值:
csc(x)-cot(x) = 1/sin(x) - cos(x) / sin(x) (将cot(x)转化为cos(x)/sin(x))
= (1-cos(x)) / sin(x) (通分并合并分母)
= 2sin^2(x/2) / 2sin(x/2)cos(x/2) (利用半角公式sin(x) = 2sin(x/2)cos(x/2))
= sin(x) / cos(x) = tan(x) (约分并用tan(x)代替sin(x)/cos(x))
因此,csc(x)-cot(x)等于tan(x)。
csc(x)-cot(x) = 1/sin(x) - cos(x) / sin(x) (将cot(x)转化为cos(x)/sin(x))
= (1-cos(x)) / sin(x) (通分并合并分母)
= 2sin^2(x/2) / 2sin(x/2)cos(x/2) (利用半角公式sin(x) = 2sin(x/2)cos(x/2))
= sin(x) / cos(x) = tan(x) (约分并用tan(x)代替sin(x)/cos(x))
因此,csc(x)-cot(x)等于tan(x)。
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