Can someone with explain how to do these, with formulas or techniques?

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

Sin(a)+cos(a)+cot(a)-1=2(csc(x)+1)

Ihave, but this question is gonna probably get deleted.