1. 求sec(π/3)的值. sec(π/3) = 1/(cosπ/3) = 2 答案是:C2. 用计算器算 csc(π/10) . csc(π/10) = 1/(sinπ/10) >2, 答案是:D3. 已知cosθ=√2/2,求θ 答案是: B
(图已经传上,稍等即可) (2x+1)(3x-2)= 6x^2 - x - 2 6x^2 - x - 2 | 6x^3 + 41x^2 - 9x - 14 | x+7 6x^3 - x^2,