$\cos (270^\circ + \theta )\,\cos (90^\circ - \theta ) - \sin (270^\circ - \theta )\,\cos \theta $ નું મૂલ્ય શું છે?

  • A
    $0$
  • B
    $-1$
  • C
    $0.5$
  • D
    $1$

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