Hello, afeasfaerw23231233!

We have to "talk" our way through these . .

Find the values of in the range

We have: .

Clearly, we are dealing with multiples of 45°: .

When is between ?

Examine the unit circle . . .

Answer: .

This one takes a bit more "talking" . . .

We have: .

The product of two factors is negative if the factors have opposite parity.

Hence, there aretwocases to examine . . .

. . is negative in quadrants 2 and 3: .

. .

The intersection of the two sets is: .

. . is positive in quadrants 1 and 4: .

. .

The intersection of the two sets is: .

The solution is: . . . . Quadrants 2 and 3