If f:R→R is a continuous and differentiable function such that ∫(-1)ˣ f(t)dt+f"'(3) int_x⁰ dt= ∫1ˣ t³dt-f'(1) i∫ˣ t²dt+f"(2) i∫x³ tdt then the value of f'(4) is ____.