If sin[90 - (A+B)] = cosx = cosy, then find the value of x and y; if y is the angle C of triangle ABC.(In triangle ABC, A + B = 90∘)

If sin[90 - (A+B)] = cosx = cosy, then find the value of x and y; if y

1.	If sin[90 - (A+B)] = cosx = cosy, then find the value of x and y; if y is the angle C of triangle ABC.(In triangle ABC, A + B = 90∘)
Answer» If sin[90 - (A+B)] = cosx = cosy, then find the value of x and y; if y is the angle C of triangle ABC. (In triangle ABC, A + B = $90^{\circ}$ )