यदि $\sin \theta - \cos \theta = 0$ है,तो $(\sin^4 \theta + \cos^4 \theta)$ का मान क्या होगा?

  • A
    $\frac{1}{2}$
  • B
    $\frac{3}{4}$
  • C
    $1$
  • D
    $\frac{1}{4}$

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निम्नलिखित सर्वसमिका को सिद्ध कीजिए,जहाँ कोण न्यून कोण हैं जिनके लिए व्यंजक परिभाषित हैं:
$(\sin A + \operatorname{cosec} A)^2 + (\cos A + \sec A)^2 = 7 + \tan^2 A + \cot^2 A$

$\frac{1}{\cos ^{2} \theta}-1 = \ldots$

$\cos \theta = \frac{b}{\sqrt{a^2 + b^2}}$; जहाँ,$0 < \theta < 90^\circ$; तो $\sin \theta = \dots$

यदि $\tan \theta + \sec \theta = l$ है,तो सिद्ध कीजिए कि $\sec \theta = \frac{l^{2} + 1}{2l}$.

सिद्ध कीजिए कि $\frac{1+\sec \theta-\tan \theta}{1+\sec \theta+\tan \theta}=\frac{1-\sin \theta}{\cos \theta}$

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