Q.
Which of the following values are positive? (a) cos120° (b) sin210° (c) tan240° (d) cos315°
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a
(c) and (b)
b
(c) and (d)
c
(a) and (d)
d
(a) and (b)
answer is B.
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Detailed Solution
240°lies in 3 rd quadrant and tan in 3rd quadrant is positive.315° lies in 4th quadrant and cos in 4th quadrant is positive.