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