∵cosα＞0,∴2kπ-π/2＜α＜2kπ+π/2 (k∈Z).
若cosα＜0,則,（2k+1)π-π/2＜α＜(2k+1)π+π/2 (k∈Z).
cosα>0,α的取值范圍是什么
cosα>0,α的取值范圍是什么
如果cosα
如果cosα
數(shù)學(xué)人氣：882 ℃時(shí)間：2020-07-14 23:35:40
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