答:倍角公式的口诀为:sin3α=4sinα·sin(π/3+α)sin(π/3-α) cos3α=4cosα·cos(π/3+α)cos(π/3-α) tan3a = tan a · tan(π/3+a)· tan(π/3-a sin2α=2sinαcosα tan2α=2tanα/(1-tan^2(α))...
发布时间:2025-10-31 浏览量:2