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    Curve with stationary points

    Homework Statement A curve is defined for x<-2 by the equation y=((x^2)+3)sqr(x+2) a) Show that dy/dx=0 when x=-1 and find the x-coordinate of the other stationary point. b) Find the value of d^2y/dx^2 when x=-1 hence determine whether the turning point is max or min. Homework...
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    Gradient of stationary points

    Homework Statement gradient of the stationary points of y=1-2sinx domain 0<x<2pi Homework Equations The Attempt at a Solution dy/dx = -2cosx -2cosx=0......?
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    Stationary points of y=-sinx+cosx

    Homework Statement Solve the stationary points of y=-sinx+cosx for domain -pi<x<pi Homework Equations The Attempt at a Solution Differentiate: d/dx=cosx+sinx But how do i solve?