[" 19- seff(z) "=2^(" in "x)" ,then what is the derivative of "f(x)" ? "],[[" (a) "2sin y-1" n "2," (b) "(sin x)2^(sin x^(-1))],[" (c) "(cos x)2^(sin x^(-1))," (d) "2^(x)(1cos2)^(2)]]