Question

limit question!!!------>please help! (continued in the link)

Answer 1

\[\lim_{h \rightarrow o} \cos((\pi/2)+h)/h\] is...?

Answer 2

\[\lim_{h \rightarrow 0}\frac{\cos(\pi/2+h)-\cos(\pi/2)}{h}=(\cos(x))' \] at x = pi/2 which is -sin(pi/2) = -1

Answer 3

you can apply the definition of a derivative or just use L'hopital rule

Answer 4

thank you!!!