化简:cos(90°+α)·csc(370°+α)·tan(180°-α)/sec(360°-α)·sin(180°+α)·cot(90°-α）·是乘号.最后答案是1.求过程.= =。啊sorry……是270°……我看错了。呃。【cos(90°+α)·csc(270°+α)·tan(180°-α)】/【sec(360°-α)·sin(180°+α)·cot(90°-α）】
问题描述：
化简:cos(90°+α)·csc(370°+α)·tan(180°-α)/sec(360°-α)·sin(180°+α)·cot(90°-α）
·是乘号.最后答案是1.求过程.
= =。啊sorry……是270°……我看错了。呃。
【cos(90°+α)·csc(270°+α)·tan(180°-α)】/【sec(360°-α)·sin(180°+α)·cot(90°-α）】
答
还是原来的题目错了,现在对了
cos(90°+α)·csc(270°+α)·tan(180°-α)/sec(360°-α)·sin(180°+α)·cot(90°-α）
=sin(-a)*(-1/cosa) * tan(-a) / (1/cos(a))sin(-a)tan(a)
=1
终于和答案对上了
采纳我吧