
cos2α,sin2α,tan2α,cos∧2α,sin∧2α,tan∧2α你们知道分别为

若锐角θ满足sinθ cosθ,且sinθ cosθ=√6/2,那么tan(θ-π/6)的值

根号(cos∧2 600度)是多少?怎么算

α=kπ 7π/12或a=kπ-π/12,∵sⅰna-cosa>1,∴a在第二象限即a=2kπ
图片内容是:cos2α-1
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((sinα)/(sinα-cosα))-(sinα cosα)/(tanα-1))化简

已知tanα=-1/3计算1/2sinαcosα

sinacosa可以得到根号3sinx/2cosx/2=根号3/2sinx根据二倍角公式cosα

2sinαcosα=3/4 ① (sinα)^2 (cosα)^2=1 ② 由① ②,得 (sinα

化简√2cosα-√2sinα 2 2011-10-17 (2-2cosθ)/(3-2sinθ) 求化简