Question 616202
CAST is the key to this.  Starting in the 4th quadrant and moving counter clock wise, write CAST.<P>
IV quadrant - only COS (and its reciprocal SEC) are positive.<br>
I quadrant - All trig functions are positive.<BR>
II quadrant - SIN (and CSC) are positive.<BR>
III quadrant - TAN (and COT) are positive.<P>

- Condition 1 indicates this is in quadrant I or II.<BR>
- Condition 2 (TAN must be positive) eliminates quadrant II (TAN is negative in quadrant II), so it must be quadrant I.<P>
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