I already solved the number 1 but i can't solve the number 2...

Here's the solution:

cosx - (sinx - 1) / cosx = (sinx - 1) = sinx / 1 - cosx

*you'll cancel -(sinx - 1) and + (sinx -1) since that the first term is expressed in negative while the other is positive (outside the parentheses)

cosx / cos x = sinx / 1- cosx

1 = sinx / sinx

1=1

i hope it'll help...