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If sintheta=(-4)/(5)andtheta lies in ...

If `sintheta=(-4)/(5)andtheta` lies in third quadrant then `"cos"(theta)/(2)`=

A

a) `(1)/(sqrt(5))`

B

b) `-(1)/(sqrt(5))`

C

c) `sqrt((2)/(5))`

D

d) `-sqrt((2)/(5))`

Text Solution

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The correct Answer is:
B
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