[sin(A-派)cot(A-2派)]/[cos(A-派)tan(A-2派)]

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[sin(A-派)cot(A-2派)]/[cos(A-派)tan(A-2派)][sin(A-派)cot(A-2派)]/[cos(A-派)tan(A-2派)][sin(A-派)cot(A-2派)]/[c

[sin(A-派)cot(A-2派)]/[cos(A-派)tan(A-2派)]
[sin(A-派)cot(A-2派)]/[cos(A-派)tan(A-2派)]

[sin(A-派)cot(A-2派)]/[cos(A-派)tan(A-2派)]
sin(A-派)=-sin A
cos(A-派)=-cos A
cot A=cos A/sin A
tan A=sin A/cos A
所以[sin(A-派)cot(A-2派)]/[cos(A-派)tan(A-2派)]
=-sin Acot A/(-cos Atan A)
=-cos A/(-sin A)
=cot A