Math & time

Differentiate y=son 4x with respect to x.

Find the equation of the ellipse with the focus at (1,2), directrix x+y+1=0 and eccentricty=½.

if f(x)=x³-3x+1/2, then f (1/2) is one of the following: (a)-7/8 (b)3/8 (c)7/8 (d)-5/8 (e)5/8