- #1
Brunno
- 80
- 0
Homework Statement
I'm learning now about darivative all by my self (without a teacher) and I'm not sure about this development
Homework Equations
The Attempt at a Solution
[tex]Y=senx[/tex]
[tex]y+{\Delta}Y=sen(x+{\Delta}Y)[/tex]
[tex]{\Delta}Y=senx*cos{\Delta}x+ sen{\Delta}x*cosx[/tex]
What about this cos,what is it doing in the equation?
I really don't get it.