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त्रिकोणमितीय फलन $\tan \frac{19 \pi}{3}$ का मान ज्ञात कीजिए।

यदि $x = y \cos \frac{2\pi}{3} = z \cos \frac{4\pi}{3}$ है,तो $xy + yz + zx = $

व्यंजक $2 \cot^2 \theta - \cot \theta - 3$ का गुणनखंड कीजिए।

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$\alpha \in R$ के लिए $(\cos \alpha, \sin \alpha)$ और $(\cos (\pi+\alpha), \sin (\pi+\alpha))$ बिंदुओं की दिशाएँ क्या हैं?

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