Solve cot (3x) = - squareroot 3 / 3.

Cotangent is the inverse of tangent function. Hence, in this case, the equation is converted to tan 3x = - 1 / squareroot 3 / 3 = - squareroot 3using a calculator in the radians mode, 3x is equal to - pi/3. This means x should be equal to - pi/18.