Question

Can someone help me understand this?

Answer 1

How did they change the numerator on the left into the one on the right? X-1 does not equal 1-X....right??

Answer 2

Does not matter, because it is all squared

Answer 3

(sin(x)-1)^2 = (-1*(1-sin(x)))^2 = (-1)^2 * (1-sin(x))^2 = (1-sin(x))^2

Answer 4

Remember that (-1)^2 = 1

Answer 5

Thank you so much!

Answer 6

No problem ;)