$\tan 57^{\circ} - \tan 12^{\circ} - \tan 57^{\circ} \tan 12^{\circ}$ का मान क्या है?

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    इनमें से कोई नहीं

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$\cos 15^\circ - \sin 15^\circ$ का मान किसके बराबर है?

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