I have absolutely no idea how you do these. the text book is too complicated and doesnt really explain it very well. could anyone give me a hand doing some of these in detail so i can do the rest myself for a test tomorrow?

Find the Taylor series expansions of each of the following functions of

x and y about the points given:

i) $\displaystyle f(x,y)=sinh(x)cosh(y)$ about $\displaystyle (x,y)=(0,0)$

ii)$\displaystyle f(x,y)=ln(1+x+y)$ about $\displaystyle (x,y)=(0,0)$

thanks