SOLUTION: 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

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

(d) degrees -> In Quadrant is

(e) degrees ->In Quadrant is

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