The first one is

sinx+cosx=0 solve between 0 and 2pi

See I am not sure how to start this one?

The next question is find find for all real values of x

3tanx^2= square root 3 tanx Also the square root only covers 3

So to do this one would I have to square the square root of 3 on one side

Then on the other side do (3tanx^2)(3tan^2x)

Also the x is on the tan not on the exponent.