1) f'(x)= (x⁴-3)'(x³+4)+(x⁴-3)(x³+4)'= 4x³(x³+4)+3x²(x⁴-3)= 4x⁶+16x³+3x⁶-9x²= 7x⁶+16x³-9x²
2) f'(x)= 7(3-2x)⁶*(-2)= -14(3-2x)⁶
3) f'(x)= 7cos7x
4) f'(x)= 2cos(x)*(-sin(x))= -sin(2x)
1) f'(x)= (x⁴-3)'(x³+4)+(x⁴-3)(x³+4)'= 4x³(x³+4)+3x²(x⁴-3)= 4x⁶+16x³+3x⁶-9x²= 7x⁶+16x³-9x²
2) f'(x)= 7(3-2x)⁶*(-2)= -14(3-2x)⁶
3) f'(x)= 7cos7x
4) f'(x)= 2cos(x)*(-sin(x))= -sin(2x)