sixteen *(four *x^ two /(x^ two + four) - one)/(x^ two + four)^ two = zero
16 multiply by (4 multiply by x squared divide by (x squared plus 4) minus 1) divide by (x squared plus 4) squared equally 0
sixteen multiply by (four multiply by x to the power of two divide by (x to the power of two plus four) minus one) divide by (x to the power of two plus four) to the power of two equally zero
16*(4*x2/(x2 + 4) - 1)/(x2 + 4)2 = 0
16*4*x2/x2 + 4 - 1/x2 + 42 = 0
16*(4*x²/(x² + 4) - 1)/(x² + 4)² = 0
16*(4*x to the power of 2/(x to the power of 2 + 4) - 1)/(x to the power of 2 + 4) to the power of 2 = 0
16(4x^2/(x^2 + 4) - 1)/(x^2 + 4)^2 = 0
16(4x2/(x2 + 4) - 1)/(x2 + 4)2 = 0
164x2/x2 + 4 - 1/x2 + 42 = 0
164x^2/x^2 + 4 - 1/x^2 + 4^2 = 0
16*(4*x^2 divide by (x^2 + 4) - 1) divide by (x^2 + 4)^2 = 0