Mathematics Trigonometry Inverse Trigonometric Functions

Value of  cos-1 (cos\(\frac{13\pi }{6}\))  is 

1
\(\frac{13π }{6}\)
2
\(\frac{-π }{6}\)
3
\(\frac{-13π }{6}\)
4
\(\frac{π }{6}\)

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