In the integration ax What is the value of u? xVI-4ln -x a. 1 = 4ln-x b. 1 = Inx 2 c. u = Inx2 d. u = Inx O A O O C O DIn the integration ax V9-4x , What is the implicit derivative of u? a. du = 2dx b. du = c. du =- 2dx d. du = 4dx O A O B O C O DIn the integration of (csc 5t)(cot 5t) dt, what is the correct "u"?* O (csc 5t)(cot 5t) O cot 5t O 5t O csc 5t Suppose we wish to find the integral of x dx/(1+x^4), the first step to solve this is by Using U-substitution O Substitute "tan(a)" to "x" O Substitute "sin(a)" to "x" Using inverse trigonometric formula