Question

化简三角函数式子(level1下 P30)

Answer 1

11. sin(α+180度)*cos(-α)*sin(-α-180度)=[- sinα]*cos(-α)*[-sin(-α)=[- sinα]*[cos(α)]*[sin(α)]=-[sinα]^2*[cos(α)]2.(sin(-α))立方*cos(2π+α)*tan(-α-π)=(-sina)^3*cosa*tan(-a)=-(sina)^3*cosa...