kosekant=1/sine, so square=1/sine^2...yu get a thang that go up tu infinity at x=0
& tu - infinity at x=pi (180 deg)
Square it & both gotu + infinity
yer equashun be like x^2+3x-4=0, so hav roots at x=1 & x=-4, so funk=0 at x=1 radian
add 2 pi tu -4 tu get other zero