Find all solutions of the equation  which are on the interval

Solve the equations by hand.

1.Find all possible solutions of the equation . Hint: find all possible solutions for (x/3) and multiply whole expression by 3.

2.Find all solutions of the equation . Hint: factor and use property of product = 0

3.Find all solutions of the equation Hint: make product = 0

4.Find all solutions of the equation  which are on the interval .

Find all solutions of the equation  which are on the interval . Hint: use all possible solutions and k=0, next step: use k=1, find solution… keep doing same steps while solutions are in the interval [0,2p