We want to apply integration by parts method. For the integral ∫eˣ cos(x) dx the outcome of IBP method is
a. ½ [eˣ sin(x) + eˣ cos(x)] + C
b. ½ [(x+1)eˣ sin(x) - eˣ cos(x)] + C
c. ½ [xeˣ sin(x) + xeˣ cos(x)] + C
d. ½ [eˣ sin(x) – eˣ cos (x)] + C