I am confused about

ill a xu'(x) a>0,a+1 SAMPLE QUESTIONS 9) Find the derivative of y = Vcot-1(x). Answer: y = Vcot-1(x) = (cot-1(x)) 3 Rewrite the function as a function to a power. u = cot-'x U'= - 1 1 + x2 Use the power chain dx [un] = nun - 1 x u' rule to find the deriva- 1 tive. = 3(cot-1x) 3 X( -1+ x2) dy 1 (cot-1x) 3 dx 3 (1 + x2)