化简:cos(A-π/2)·cot(-A-3π/2)·色彩(-A+5π/2)·tan(5π/2+A),
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化简:cos(A-π/2)·cot(-A-3π/2)·色彩(-A+5π/2)·tan(5π/2+A),
化简:cos(A-π/2)·cot(-A-3π/2)·色彩(-A+5π/2)·tan(5π/2+A),
化简:cos(A-π/2)·cot(-A-3π/2)·色彩(-A+5π/2)·tan(5π/2+A),
那个“色彩”是sec吗?就当是吧……
因为:cot=1/tan sec=1/cos
所以:上式可写为:cos(A-π/2)·sec(-A+5π/2)·cot(-A-3π/2)·tan(5π/2+A)
=cos(A-π/2)·sec(-A+π/2) ·tan(π/2+A)·cot(-A-3π/2)
=cos(A-π/2)·sec(A-π/2) ·tan(π/2+A) ·cot(-A+π/2)
=1 ·tan(π/2+A) ·cot(-A+π/2)
=-tan(π/2+A) ·cot(A+π/2)
=-1