Ok. So the limit definition by your notation should be something like . So to handle the numerator use this identity - . Apply this to your limit and post back what you find.
ok (d/dx) sin x= cos x
therefore (d/dx)cos x= -sinx
but how do u explain in terms how (d/dx)cosx = sin x
i believe i am supposed to us the formula f'(x)= F(x + h) - f(x) / h
but can someone show me how it is done so i can understand how it is expressed.
Ok. So the limit definition by your notation should be something like . So to handle the numerator use this identity - . Apply this to your limit and post back what you find.