$\tan 100^\circ + \tan 125^\circ + \tan 100^\circ \tan 125^\circ = $

  • A
    $0$
  • B
    $1/2$
  • C
    $-1$
  • D
    $1$

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सिद्ध कीजिए कि: $\frac{\sin 5x + \sin 3x}{\cos 5x + \cos 3x} = \tan 4x$

मान लीजिए $\tan \alpha = \frac{a}{a+1}$ और $\tan \beta = \frac{1}{2a+1}$, तो $\alpha + \beta$ का मान क्या है?

यदि $x + y = \frac{\pi}{4}$ है, तो $(1 + \tan x)(1 + \tan y) =$ का मान क्या होगा?

सिद्ध कीजिए कि: $\sin 3x + \sin 2x - \sin x = 4 \sin x \cos \frac{x}{2} \cos \frac{3x}{2}$

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यदि दो कोण $\alpha, \beta$ इस प्रकार हैं कि $0 < \alpha, \beta < \frac{\pi}{4}$,$\sqrt{1+\cos 2 \alpha}=\frac{3}{\sqrt{5}}$ और $\frac{\sqrt{1-\cos 2 \beta}}{\sqrt{1+\cos 2 \beta}}=\frac{1}{7}$,तो $(2 \alpha+\beta)=$

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