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tan(-150°)cos(-570°)cos(-1140°)/cot(-240°)sin(-690°)
人气:333 ℃ 时间:2020-06-17 08:29:04
解答
tan(-150°)cos(-570°)cos(-1140°)/cot(-240°)sin(-690°)= tan(-150°)cos(150°)cos(-60°)/cot(120°)sin(30°)= -tan(30°)cos(30°)cos(60°)/-cot(60°)sin(30°)= sin(30°)cos(30°)cos(60°)sin(60°...
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