- #1
Wholewheat458
- 18
- 0
Homework Statement
Prove using the definition of a derivative.
If y=sinx, then y1=cosx
Homework Equations
.. ? identities maybe..? i don't really know much about derivatives..
The Attempt at a Solution
y = sinx..
y1 = (1)sinx^1-1
y1 = 1..
how is that suppose to equal cosx?? !
i haven't got a clue, any help would really be appreciated!
:shy: