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...
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......?
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?