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The value of \(\tan 315°\) is:

  • A.1
  • B.-1
  • C.0
  • D.Undefined

Answer: B

315° lies in the fourth quadrant, where the tangent is negative.

\[ \tan 315^{\circ} = -\tan(360^{\circ} - 315^{\circ}) = -\tan 45^{\circ} = -1 \]

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