1) The cosine function oscillates between -1 and 1, so it is not possible for Cos(-2x) to equal 1. There is no real value of x that will satisfy this equation.
2) The sine function oscillates between -1 and 1 as well, so it is also not possible for sin(-x) to equal 1. There is no real value of x that will satisfy this equation.
1) The cosine function oscillates between -1 and 1, so it is not possible for Cos(-2x) to equal 1. There is no real value of x that will satisfy this equation.
2) The sine function oscillates between -1 and 1 as well, so it is also not possible for sin(-x) to equal 1. There is no real value of x that will satisfy this equation.