sorry about the extra ), that was a typo.
use an algebraic method.
this is pretty simple but i can't figure it out.
i just need help working out the question.
the question is: 2sinθ-1=cscθ
the answers are 90°, 210°, 330°.
.... i can't get the answers 210° and 330°, which would make sinθ= -1/2