two *(cot(x/ three)^ two - one)*cot(x/ three)/ nine = zero
2 multiply by ( cotangent of (x divide by 3) squared minus 1) multiply by cotangent of (x divide by 3) divide by 9 equally 0
two multiply by ( cotangent of (x divide by three) to the power of two minus one) multiply by cotangent of (x divide by three) divide by nine equally zero
2*(cot(x/3)2 - 1)*cot(x/3)/9 = 0
2*cotx/32 - 1*cotx/3/9 = 0
2*(cot(x/3)² - 1)*cot(x/3)/9 = 0
2*(cot(x/3) to the power of 2 - 1)*cot(x/3)/9 = 0
2(cot(x/3)^2 - 1)cot(x/3)/9 = 0
2(cot(x/3)2 - 1)cot(x/3)/9 = 0
2cotx/32 - 1cotx/3/9 = 0
2cotx/3^2 - 1cotx/3/9 = 0
2*(cot(x divide by 3)^2 - 1)*cot(x divide by 3) divide by 9 = 0
