(1)已知tanα=2, 求[sin(π-α)cos(2π-α)sin(-α+3π⼀2)] ⼀ tan(π+α)sin(π-α)

2025-04-25 10:58:56
推荐回答(1个)
回答1:

(1) -(sinα)^2cosα/ tanαsinα
=-sinαcosα/ 2
=-2(cosα)^2/2
=-(cosα)^2