1. Use Cramer's rule to solve for x:
{3x + 2y = 3
{6z - 2x = -1
{x + 2y + 4z = -2
2. Show: cos^2 x/1 - sin x = 1 + csc x/csc x
3. Solve cos 2x - cos x = 0 given that 0 </= x < 2 pi
4. Write the following as a single logarithm. Simplify:
ln (x + y) + 2 ln z - ln (y^2z - x^2z)
