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    A curve has equation y= cosx /(1+cos^2x)
    (a) Find dy/dx . [3]
    (b) Hence show that all stationary points of the curve lie on one or other of
    two lines parallel to the x-axis. State the equations of these two lines. [5]
    I've done a) but I'm struggling to understand what b is asking me to do? I'm not really sure how to start?
    Thanks !
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    (Original post by AmbaJade)
    A curve has equation y= cosx /(1+cos^2x)
    (a) Find dy/dx . [3]
    (b) Hence show that all stationary points of the curve lie on one or other of
    two lines parallel to the x-axis. State the equations of these two lines. [5]
    I've done a) but I'm struggling to understand what b is asking me to do? I'm not really sure how to start?
    Thanks !
    You want to take \frac{dy}{dx}=0, consider the x values which makes that true, and plug them into y to see which two values the function takes.
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    what RDK said... remember that you have to stay in radians for calculus work.
 
 
 
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