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.
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