[MP PET 1994]
A) $ \pm \frac{20}{41} $
B) $ \pm \frac{1}{21} $
C) $ \pm \frac{21}{29} $
D) $ \pm \frac{20}{21} $
Correct Answer: C
$ \tan \theta =\frac{20}{21}\Rightarrow \cos \theta =\pm \frac{21}{29} $ .
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