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C3 differentiation question

Hey been trying to do this question could someone please help me out
Given that y=e^x-e^-x show that (Dy/Dx)^2=y^2+4
So what did you get for dy/dx? Well square that and then rearrange initial equation to substitute for y.
Original post by Pussyismoney
Hey been trying to do this question could someone please help me out
Given that y=e^x-e^-x show that (Dy/Dx)^2=y^2+4


What is the first derivative?
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Avatar for ThomH97
ThomH97
21
Have you found out what dy/dx is?
Original post by black1blade
So what did you get for dy/dx? Well square that and then rearrange initial equation to substitute for y.

Hey for dy/dx i got e^x+e^-x and that squared i got e^2x+e^-2x +2 and im stuck there :s
Original post by Pussyismoney
Hey for dy/dx i got e^x+e^-x and that squared i got e^2x+e^-2x +2 and im stuck there :s


Well questions tells you the show that that is equal to y^2 +4 so why don't you try squaring y squared to see what that gives you.

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