$\tan 57^{\circ} - \tan 12^{\circ} - \tan 57^{\circ} \tan 12^{\circ}$ નું મૂલ્ય કેટલું થાય?

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

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$4\sin^2 x + 3\cos^2 x$ ની મહત્તમ કિંમત કેટલી છે?

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