Convert 120 to radians. O radians O radians O radians 3 O 2 radians 8) Find the derivative. Of' ( x) = -2 cot x cschx f(x) = cot x Of'(x) = 2 cos x csc' x Of'(x) = -2 cot x sec- x Of'(x) = 2 cos x sec' x None of the above 9)