A lot of what you've posted is nonsense, because have no meaning unless you have a number or variable attached.

Also, you haven't specified what you wanted to do with these equations.

I'm assuming for 1 and 2, you're using identites to simplify, and for 4, 5, 6, you're solving the equations.

1. .

Here multiply the top and bottom of each term by a cleverly disguised 1.

.