Differentiate (a) f(x) = {√(x +15)} (x(2/5)+3x+10) (b) f(x)=(5x³+x²-3)/(x²+7x+1) (c) f(x) = -5x²(3x-5)4 (d) f(x) = (x³ + (x²+2x+100)²34 (e) 4x. log 2 5x (f) 9x/(x²+2x+3) (2 is the base of log)