sin(π－α)+cos(π/2+α)＝－m則cos(3π/2)+2sin(2π-α)＝A,-2/3m B,2/3m C,3/2m D,-3/2m

熱心網(wǎng)友

大哥，α是第幾向限的角啊？

熱心網(wǎng)友

sin(π－α)+cos(π/2+α)＝－m則cos(3π/2)+2sin(2π-α)＝sina-sina=0=-mm=0cos(3π/2)+2sin(2π-α)＝0+2sina=2sina