nine *(-(tan(three *x)^ two + one)^ two /tan(three *x)^ two + two *tan(three *x)^ two + two) = zero
9 multiply by ( minus ( tangent of (3 multiply by x) squared plus 1) squared divide by tangent of (3 multiply by x) squared plus 2 multiply by tangent of (3 multiply by x) squared plus 2) equally 0
nine multiply by ( minus ( tangent of (three multiply by x) to the power of two plus one) to the power of two divide by tangent of (three multiply by x) to the power of two plus two multiply by tangent of (three multiply by x) to the power of two plus two) equally zero