(- six *cos(one /x) + (two *sin(one /x) + cos(one /x)/x)/x + four *sin(one /x)/x)/x^ four = zero
( minus 6 multiply by co sinus of e of (1 divide by x) plus (2 multiply by sinus of (1 divide by x) plus co sinus of e of (1 divide by x) divide by x) divide by x plus 4 multiply by sinus of (1 divide by x) divide by x) divide by x to the power of 4 equally 0
( minus six multiply by co sinus of e of (one divide by x) plus (two multiply by sinus of (one divide by x) plus co sinus of e of (one divide by x) divide by x) divide by x plus four multiply by sinus of (one divide by x) divide by x) divide by x to the power of four equally zero