Please solve the following questions with fill solution. Thanks.?

1.
f(x) = x² / lnx
f ' (x) = (2xlnx - x) / (lnx)²
Answer (B)

2.
f ' (x) = e^(2x) + x + 3
f(x) = (1/2)e^(2x) + (1/2)x² + 3x + C
f(0) = 1 = 1/2 + C
C=1/2
f(x) = (1/2)e^(2x) + (1/2)x² + 3x + 1/2
f(1) = (1/2)e^(2) + (1/2)1 + 3 + 1/2
Answer (B)

3.
f(x) = xcosx
f ' (x) = cosx -xsinx
f ' (π/3) = 1/2 - (π/3)(√3/2)
Answer (E)