Question

sin x + cos y = 1 ; x=30° and y is acute angle , find the value of y

Answer 1

sin x +cos y = 1,
x = 30 degree,
sin x = sin 30
sin 30 = 1/2
1/2 + cos y = 1
cos y = 1 - 1/2
cos y = (2- 1)/2
cos y = 1/2 
so y = 60 degree

Answer 2

sin x + cos y =1
given: x=30°
sin 30=1/2
hence , 1/2 +cos y=1
cos y=1-1/2
=1/2
y= 60°