જો $b \sin \alpha = a \sin (\alpha + 2\beta)$ હોય,તો $\frac{a + b}{a - b} = $

  • A
    $\frac{\tan \beta}{\tan (\alpha + \beta)}$
  • B
    $\frac{\cot \beta}{\cot (\alpha - \beta)}$
  • C
    $\frac{-\cot \beta}{\cot (\alpha + \beta)}$
  • D
    $\frac{\cot \beta}{\cot (\alpha + \beta)}$

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$0 \le \alpha_1, \alpha_2, \dots, \alpha_n \le \frac{\pi}{2}$ અને $\cot \alpha_1 \cdot \cot \alpha_2 \cdots \cot \alpha_n = 1$ ની શરતો હેઠળ $\cos \alpha_1 \cdot \cos \alpha_2 \cdots \cos \alpha_n$ નું મહત્તમ મૂલ્ય શું છે?

Difficult
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$\frac{{\sin (B + A) + \cos (B - A)}}{{\sin (B - A) + \cos (B + A)}} = $

$x = 1 - x + x^2 - x^3 + x^4 - x^5 + \dots \infty$ સંબંધનું પાલન કરતી $x$ ની કિંમત શોધો.

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