(d.) yx)n let u(t) be a continuously differentiable function taking nonnegative values for t > 0 and satisfying u'(t)=4u3 (t); u(0) = 0. then (a.) ut) =0. diffe

(d.) yX)N Let u(t) be a continuously differentiable function taking nonnegative values for t > 0 and satisfying u'(t)=4u3 (t); u(0) = 0. Then (a.) ut) =0. differentiable 2. values for t> 0 (b.) u(t) =. 0 for 0