[" 59.Which of the following functions is an injective (one-one) "],[" function in its respective domain? "],[[" (a) "f(x)=2x+sin3x],[" (b) "f(x)=x*[x]" ,(where "[" (d) "" denotes the "6.1,5],[" (c) "f(x)=(2^(x)-1)/(4^(x)+1)],[" (d) "f(x)=(2^(x)+1)/(4'-1)]]