(-sin(x)^ two + cos(x)^ two)/(x + one) - sin(x)*cos(x)/(x + one)^ two = zero
( minus sinus of (x) squared plus co sinus of e of (x) squared ) divide by (x plus 1) minus sinus of (x) multiply by co sinus of e of (x) divide by (x plus 1) squared equally 0
( minus sinus of (x) to the power of two plus co sinus of e of (x) to the power of two) divide by (x plus one) minus sinus of (x) multiply by co sinus of e of (x) divide by (x plus one) to the power of two equally zero