Question 933382: Use the CAST rule to state the sign of each value. Check using calculator.
(a) tan 15 degrees
(b) sin 120 degrees
(c)cos 135 degrees
(d) tan(-15 degrees)
(e) sin(-45 degrees)
Thank you
Answer by MathLover1(20850)   (Show Source):
You can put this solution on YOUR website! here is a pattern:
In the first quadrant ( ), all ratios are  .
In Quadrant  ,  is positive,  and  are negative.
In Quadrant  , is positive (both  and  are negative, so  is positive), and  are negative.
In Quadrant  , is positive, and  are negative.
Of course the reciprocal ratios,  ,  and  follow the same pattern:
In Quadrant ,  is positive, and are negative.
In Quadrant , is positive, and are negative.
In Quadrant , is positive, and are negative.
then, your answers will be:
(a)  degrees ->In the first quadrant (), all ratios are .
(a) 
(b)  degrees ->In Quadrant is
(c) degrees->In Quadrant  is 
(d)  degrees -> In Quadrant is
(e)  degrees ->In Quadrant is
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