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# C3 Differentiation help watch

1. 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 !
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 , consider the values which makes that true, and plug them into to see which two values the function takes.
3. what RDK said... remember that you have to stay in radians for calculus work.

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Updated: November 1, 2017
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