Make a serious effort to look up and memorize the CAST rule
It says that the cosine is positive in quads I and IV, so it must
be negative in II and III
It says that the tangent is positive in I and III, so it must
be negative in II and IV
what quadrant is the common negative ratio?
If the cosine and tangent are both negative, the angle must be in quadrant -_____.
IV
I
II
III
1 answer