$\cos A + \sin (270^\circ + A) - \sin (270^\circ - A) + \cos (180^\circ + A) = $

  • A
    $-1$
  • B
    $0$
  • C
    $1$
  • D
    આમાંથી કોઈ નહીં

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$6$ રેડિયનને અંશ માપમાં ફેરવો.

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