જો $\tan A = -\frac{1}{2}$ અને $\tan B = -\frac{1}{3}$ હોય,તો $A + B = $

  • A
    $\frac{\pi}{4}$
  • B
    $\frac{3\pi}{4}$
  • C
    $\frac{5\pi}{4}$
  • D
    આમાંથી કોઈ નહીં

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$\cos ^2 48^{\circ}-\sin ^2 12^{\circ} = $ . . . . . . ,જો $\sin 18^{\circ} = \frac{\sqrt{5}-1}{4}$ હોય તો.

જો $\tan A = \frac{1}{2}$ અને $\tan B = \frac{1}{3}$ હોય,તો $\cos 2A = $

$\triangle ABC$ માં,જો $A = \tan^{-1} 2$ અને $B = \tan^{-1} 3$ હોય,તો $C = $ . . . . . . ($^{\circ}$ માં)

$\cos 105^\circ + \sin 105^\circ$ નું મૂલ્ય શું છે?

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