Write a formula for function f in terms of function g.

so hmm if you notice, your f(x) there, looks just like g(x), but is "shifted horizontally" by about 9 units to the right

that simply means, based on that template above, that C/B = -9, and we can simply make B = 1  and C = -9, and we get C/B = -9/1 which is -9

thus   

Sin(a)+cos(a)+cot(a)-1=2(csc(x)+1)