જો $12a + 5b = 9$,જ્યાં $a, b \in R$ હોય,તો $a^2 + b^2$ ની ન્યૂનતમ કિંમત કેટલી થાય?

  • A
    $\frac{81}{169}$
  • B
    $\frac{169}{81}$
  • C
    $\frac{9}{13}$
  • D
    $\frac{31}{9}$

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જો $\tan \theta = \frac{\sin \alpha - \cos \alpha}{\sin \alpha + \cos \alpha}$ હોય,તો $\sin \alpha + \cos \alpha$ અને $\sin \alpha - \cos \alpha$ ની કિંમત શું થાય?

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