QUESTION 1 Let f(x) =x2e-X. Find the interval (a,b) on which f increases. As your answer please input a + b. QUESTION 2 Let f(x) = sin(2x) + (V2)x be defined on [O,TI]. Find the local minimum and local maximum of f in the interval [, ]. As your answer please input the total sum of the relative extrema found in [O, ] in decimal format with three significant digits after the decimal point. QUESTION 3 Let f(x) = sin(2x) + (V2)x be a function defined on [o, It]. Find the interval (a, b), Os a