Answer:
(cos^2 y) /(1-sin y) = (1 - sin^2 y) / (1-sin y) = ((1-sin y)(1+sin y)) / (1-sin y) = 1+sin y
so first you add something and then subtract and then divide then you er butf then youcan see toplod ej
x-8°+20°= 90°
=>x+12°=90°
=>x=90°-12°
=>x= 78°
