1.求sec(π/3)的值.sec(π/3) = 1/(cosπ/3) = 2 答案是:C
2.用计算器算 csc(π/10) .csc(π/10) = 1/(sinπ/10) >2,答案是:D
3.已知cosθ=√2/2,求θ 答案是:B
数学预备微积分pre-calculus!
1.求sec(π/3)的值.sec(π/3) = 1/(cosπ/3) = 2 答案是:C
2.用计算器算 csc(π/10) .csc(π/10) = 1/(sinπ/10) >2,答案是:D
3.已知cosθ=√2/2,求θ 答案是:B