Evaluate the integral: V1+49x2dx (A) Which trig substitution is correct for this integral? 1 x= tan(0) 1 x = -tan(0) 49 Ox= 49 sin(0) x= sec(0) 1 x = 49 x = 7 cos(0) sec(0) (B) Which integral do you obtain after substituting for and simplifying? Note: to enter, type the word theta. de (C) What is the value of the above integral in terms of 6? + C (D) What is the value of the original integral in terms of a? + C