Question

How do I solve (cos(pi/3 +h) - 1/2)/ h as h --> 0 but without lhopitals rule

Answer 1

try using a trig. identity

Answer 2

how would i do that ?

Answer 3

first expand cos term.

Answer 4

i have to use cos a plus b +from precalc) ?

Answer 5

yes

Answer 6

still stuck . i cant di anything with the minus 1/2 its in my way

Answer 7

Are you trying to calculate a derivative?

Answer 8

\[
\cos(x+y)=\cos(x)\cos(y)-\sin(x)\sin(y)
\]