two *((two *x + five)^ two /(x^ two + five *x + six) - one)/(x^ two + five *x + six)^ two = zero
2 multiply by ((2 multiply by x plus 5) squared divide by (x squared plus 5 multiply by x plus 6) minus 1) divide by (x squared plus 5 multiply by x plus 6) squared equally 0
two multiply by ((two multiply by x plus five) to the power of two divide by (x to the power of two plus five multiply by x plus six) minus one) divide by (x to the power of two plus five multiply by x plus six) to the power of two equally zero