`int e^x {f(x)-f'(x)}dx= phi(x)`, then `int e^x f(x) dx` is

Let int e^(x){f(x)-f'(x)}dx=varphi(x) .Then int e^(x)f(x)dx is varphi(x)=

Let inte^(x){f(x)-f'(x)}dx=phi(x) . then, inte^(x)f(x)dx is equal to

Let inte^(x){f(x)-f'(x)}dx=phi(x) . Then inte^(x)*f(x)dx is a) phi(x)+e^(x)f(x) b) phi(x)-e^(x)f(x) c) 1/2{phi(x)+e^(x)f(x)} d) 1/2{phi(x)+e^(x)f'(x)}

int e^x[f(x)+f^1(x)]dx

int e^(ax)[a f(x)+f' (x)]dx=

If f(x) = f(pi + e - x) and int_e^(pi) f(x) dx = 2/(e + pi) , then int_e^(pi) xf(x) dx is equal to