sinα=√2 cosβ
cosβ=√2/2sinα
tanα=√3 cotβ
sinα/ cosα=3 cosβ/sinβ
sinβ=1/2√6cosα
sin^2β+cos^2β
=1
sin^2α+3cos^2α=2
又sin^2α+cos^2α=1
cos^2α=1/2
-π/2
sinα=√2 cosβ
cosβ=√2/2sinα
tanα=√3 cotβ
sinα/ cosα=3 cosβ/sinβ
sinβ=1/2√6cosα
sin^2β+cos^2β
=1
sin^2α+3cos^2α=2
又sin^2α+cos^2α=1
cos^2α=1/2
-π/2