17. Find - for the following functions. Do not simplify your answer. a) y = x*log4(x2 -5) b) y = In(sin(x)) 4x c) x = 7+exy d) y = sec ( Vx) e) y = etan(x3) f) y = (sin(x +4)) *2 18. Find a linear approximation forf (x) = vx + 3 to approximate v8.8. (Ans: L(x) = 3+ = (x - 6), V8.8 ~ L(5.8) = 2.9666667)