$\triangle ABC$ માં, જો $a = 13, b = 14, c = 15$ હોય, તો $\sin A + \cos A$ નું મૂલ્ય છે...

  • A
    $\frac{3}{5}$
  • B
    $\frac{7}{5}$
  • C
    $\frac{4}{5}$
  • D
    $\frac{12}{5}$

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$\triangle ABC$ માં,જો $r_1 = 2r_2 = 3r_3$ હોય,તો $b : c$ ની કિંમત શોધો.

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