已知sin(5π-α)=√2cos(3π/2+β),)√3cos(-α)=-√2cos(π+β),0
已知sin(5π-α)=√2cos(3π/2+β),)√3cos(-α)=-√2cos(π+β),0
已知sinα=√2sinβ,√3cosα=√2cosβ,0
化简:1、sin(x-π/3)-cos(x+π/6)+√3cosx=?2、已知,sinα+sinβ=√2/2,求cosα
已知sin(3π-a)=√2cos(1.5π+β),√3cos(-a)=-√2cos(π+β),且0
已知向量a=(sinα+cosα,√2sinα),b=(cosα-sinα,√2cosα),a∈[0,π/2],且
已知3sinα-2cosα=0,求(cosα-sinα)/(cosα+sinα)+(cosα+sinα)/(cosα-s
已知sin(3π-α)=根号二cos(3π/2+β),根号三cos(-α)=负根号二cos(π+β),且0
已知α∈(0,π/2),且2sinα-sinαcosα-3cosα=0.求[sin(α+π/4)]/[sin2α+cos
(1+sinα+cosα)*[sin(α/2)-cos(α/2)]/√(2+2cosα)化简 (3/2*π
已知sin(3π-α)=√2cos(3π/2+β)和√3cos(-α)=-√2cos(π+β),且0<α<π,0<β<π
已知(3sinα+cosα)/(3cosα-sinα)=2,则2-3sin(α-3π)sin(1.5π-α)-[cos(
已知sinα - sinβ=1/3 cosα + cosβ=1/7 0 < α,β < π/2,求sin(α+β)/2的