two *(-sin(x)^ two + cos(x)^ two - four *sin(x)*cos(x)/x + three *sin(x)^ two /x^ two)/x^ two = zero
2 multiply by ( minus sinus of (x) squared plus co sinus of e of (x) squared minus 4 multiply by sinus of (x) multiply by co sinus of e of (x) divide by x plus 3 multiply by sinus of (x) squared divide by x squared ) divide by x squared equally 0
two multiply by ( minus sinus of (x) to the power of two plus co sinus of e of (x) to the power of two minus four multiply by sinus of (x) multiply by co sinus of e of (x) divide by x plus three multiply by sinus of (x) to the power of two divide by x to the power of two) divide by x to the power of two equally zero