sin(3π-a)=√2cos(3π/2+β)
sina=√2cos(-π/2+β)= √2cos(π/2-β)= √2sinβ
√3cos(-a)=-√2cos(π+β)
√3cosa=-√2cos(π+β)=√2cosβ
cosa=√2/√3*cosβ
(sina)^2+(cosa)^2=1
(sinβ)^2+(cosβ)^2=1
2sin^2β+2/3cos^2β=1
tan^2β=1/3 β=π/6 a=π/4