find the exact solutions (è in degrees)
sin^2è+2cosè=-2
change the sin^2 to 1-cos^2, then rearrage the equation into quadratic form, use the quadratic equaion.
sin^2è+2cosè=-2
change the sin^2 to 1-cos^2, then rearrage the equation into quadratic form, use the quadratic equaion.