E'x cos x dx 2. X'2 e'x dx 3. Cos x'5 dx ?

1. The integral of e^x * cos(x) dx is e^x * sin(x) + C, where C is the constant of integration.

2. The integral of x^2 * e^x dx is (x^2 - 2x + 2) * e^x + C, where C is the constant of integration.

3. The integral of cos(x)^5 dx is (1/5) * cos(x)^5 + (2/3) * cos(x)^3 + (1/3) * cos(x) + C, where C is the constant of integration.

1. x^2 e^x dx
2. x^3 e^x dx
3. (1/6)cos x^6 dx