Verified answer

x cos y = w

x sin y = t

Quadrando e sommando

x^2 (cos^2 (y) + sin^2(y) ) = w^2 + t^2

x^2 = w^2 + t^2

x = sqrt (w^2 + t^2 )

dividendo la II per la I

tg y = t/w

y = arctg*(t/w)