Please help with the following

Find the function f such that f(r) = x + cosr and such that f(0) = 5 and f'(0) = 9. Hint: Integrate both sides of the equation twice.Find an equation of the curve that satisfies the given conditions. At each point (c, y) on the curve, the slope is 2x + 1; the curve passes through the point (-6,0).Find the general form of a function whose second derivative is 4vr. Hint: Solve the equation f"(x) =4vx for f(x) by integrating both sides twice. NOTE: Enter the arbitrary constants as A and B.\f