[MP PET 1997]
A) - 1
B) - 2
C) - 3
D) - 4
Correct Answer: A
$ \tan (-945{}^\circ )=\tan [-(945{}^\circ )] $ $ =-\tan [(2\times 360{}^\circ +225{}^\circ )] $ $ =-\tan [225{}^\circ ]=-\tan 45{}^\circ =-1 $ .
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