Here is the whole thing:

By using the defenition f'(a)=lim (f(a+h)-f(a))/h and taking smaller

values of h, estimate the value of f'(pi/4).

When i plug in the limit definition, the numbers really seem to jump around, or is that what i use to find the values? Anyway, can somebody help me with this problem? its due tomorrow. Thanks.

NOTE: due to the lack of symbols, "pi" is used in place of the greek letter