三角函数化简对吗sin(-α-3/2π)sin(3/2π-α)tan^2(2π-α)为分子
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发布时间:2024-10-03 20:42
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热心网友
时间:2024-10-31 16:54
不正确,因为:
{sin(-α-3/2π)sin(3/2π-α)tan^2(2π-α)} / {cos(π/2-α)cos(π/2+α)cot(π-α)}
= {sin(π/2-α)sin(3/2π-α)tan^2(2π-α)} / {cos(π/2-α)cos(π/2+α)cot(π-α)}
= {cosα(-cosα)tan²α)} / {sinαsinα(-cotα)}
= - {cotα cotα tan²α} /cotα
= -tan α