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# erm.....how do I differentiate an equation involving 'pi' (C3) watch

1. have an equation 'x = cos(2y+pi)

how do I differentiate it
2. Pi is just a number - so it'll be dx/dy=-2sin(2y+pi)
hope this helps
3. rememeber the chain rule and that pi is just a constant.
4. x2,

pi is just a number, its just given a symbol to represent the constant
5. I'm sure if you wrote 3.14 instead of pi you'd be able to do it.. so just do that and then swap them back at the end!

6. thank you all!!!!!!!!
7. you could always use the double angle formula to expand it

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Updated: January 17, 2010
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