Find the integral of the right hand side of the given equation: int(12x⁵+9x²+2x-1)dx
1) 2x⁶+3x³+x²-x+C
2) 2x⁵+3x²+x-1+C
3) 2x⁶+3x²+x-1+C
4) 2x⁵+3x³+x²-x+C