$a$ અને $b$ ની કિંમતો શોધો જેથી $\mathop {\lim }\limits_{x \to 0} \frac{{x(1 + a\cos x) - b\sin x}}{{{x^3}}} = 1$ થાય.

  • A
    $a = \frac{5}{2}, b = \frac{3}{2}$
  • B
    $a = \frac{5}{2}, b = -\frac{3}{2}$
  • C
    $a = -\frac{5}{2}, b = -\frac{3}{2}$
  • D
    આમાંથી કોઈ નહીં

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જો $\lim _{x \rightarrow 0} \frac{2 a \sin x-\sin 2 x}{\tan ^{3} x}$ નું અસ્તિત્વ હોય અને તે $1$ ની બરાબર હોય, તો $a$ ની કિંમત શોધો.

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