AP Calculus ABeasymcq1 ptIf F(x)=∫0xt3 dtF(x)=\int_0^x t^3\,dtF(x)=∫0xt3dt, then F′(x)=F'(x)=F′(x)=A.x3x^3x3B.3x23x^23x2C.x44\frac{x^4}{4}4x4D.t3t^3t3