1. For each case, use the first derivative sign to find the intervals of increase or decrease. a) f(x)=x -2x b) /(x) = = X C) (X)= 2. Find the intervals of increase or decrease. a) /(x) = xx b) /(x) = xe] c) /(x) = xe d) /( x) = x + sin.x 3. For each case, find the critical points. a) /(x)=x + 2x b) /(x) = 2x + 3x] C) (x)=XI d) /(x) = Vr e) /(x) =- x3 +1 4. For each case, find the critical points. a) (x) = sin x b) f (x) = tan.x d) f(x) = Inx e) /(x) = xInx