The value of the expression 1−sin2y1+cos y+1+cos ysin y−sin y1−cos y
0
1
sin y
cos y
1−1−cos2y1+cosy+(1−cos2y)−sin2ysiny(1+cosy)=1−(1−cosy)+0=cosy
The value of the expression 1−sin2y1+cos y+1+cos ysin y−sin y1−cos y