Sin > 180 - First Answer, 180 + first answer, 360 + ( depending on range)
Cos > 360 - First Answer, 360 + a, 720 - A ( depending on range)
Tan > 180 + a, second answer + 180, and add on 180 until out of range
I think this is how... and for trig equations cos^2x= 1- sin^x , most of the time you need to rearange the formula and probably get a quadric, replace all cos with y or x than solve it, you'll probably get something like (2x-1) (x-3) sub back in cos/tan/sin than solve it
i think its right, correct me pls if am wrong