If csc x = -2.5, what is the value of x?
well, you want cos x = -0.4
so, x will be an angle in QII or QIII
Your reference angle is arccos(0.4) = 66.4°
so, x will be 180±66.4°
so, x will be an angle in QII or QIII
Your reference angle is arccos(0.4) = 66.4°
so, x will be 180±66.4°