જો $\frac{5 \sinh 2x}{7+6 \cosh 2x} = \frac{3}{2}$ હોય,તો $3 \tanh^2 x + 20 \tanh x = $

  • A
    $13$
  • B
    $26$
  • C
    $39$
  • D
    $\frac{13}{2}$

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ધન પૂર્ણાંક $n$ માટે,ધારો કે ${f_n}(\theta ) = \left( {\tan \frac{\theta }{2}} \right)(1 + \sec \theta )(1 + \sec 2\theta )(1 + \sec 4\theta ) \dots (1 + \sec {2^n}\theta ).$ તો

જો $\sin x + \sin y = \alpha$ અને $\cos x + \cos y = \beta$ હોય,તો $\operatorname{cosec}(x + y) = $

બધા જ શક્ય ત્રિપુટીઓ $(a_1, a_2, a_3)$ ની સંખ્યા શોધો જેથી તમામ $x$ માટે $a_1 + a_2 \cos 2x + a_3 \sin^2 x = 0$ થાય.

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