lim _{x rightarrow 0} operatorname{cosec} xle | vedclass

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Question

(D) माना $L = \lim _{x \rightarrow 0} \frac{\sqrt{2 \cos ^2 x+3 \cos x}-\sqrt{\cos ^2 x+\sin x+4}}{\sin x}$ है।अंश का परिमेयकरण करने पर:$L = \lim _{x}

Vedclass · Accepted Answer

$-\frac{1}{2 \sqrt{5}}$

Vedclass · Answer

(D) माना $L = \lim _{x \rightarrow 0} \frac{\sqrt{2 \cos ^2 x+3 \cos x}-\sqrt{\cos ^2 x+\sin x+4}}{\sin x}$ है।अंश का परिमेयकरण करने पर:$L = \lim _{x}$ ${\rightarrow 0} \frac{(2 \cos ^2 x+3 \cos x) - (\cos ^2 x+\sin x+4)}{\sin x (\sqrt{2 \cos ^2 x+3 \cos x}+\sqrt{\cos ^2 x+\sin x+4})}$$L = \lim _{x}$ ${\rightarrow 0} \frac{\cos ^2 x+3 \cos x - \sin x - 4}{\sin x (\sqrt{2 \cos ^2 x+3 \cos x}+\sqrt{\cos ^2 x+\sin x+4})}$चूँकि $\cos ^2 x + 3 \cos x - 4 = (\cos x - 1)(\cos x + 4)$ है:$L = \lim _{x}$ ${\rightarrow 0} \frac{(\cos x - 1)(\cos x + 4) - \sin x}{\sin x (\sqrt{2 \cos ^2 x+3 \cos x}+\sqrt{\cos ^2 x+\sin x+4})}$$\cos x - 1 = -2 \sin ^2 \frac{x}{2}$ और $\sin x = 2 \sin \frac{x}{2} \cos \frac{x}{2}$ का उपयोग करने पर:$L = \lim _{x}$ ${\rightarrow 0} \frac{-2 \sin ^2 \frac{x}{2}(\cos x + 4) - 2 \sin \frac{x}{2} \cos \frac{x}{2}}{2 \sin \frac{x}{2} \cos \frac{x}{2} (\sqrt{2 \cos ^2 x+3 \cos x}+\sqrt{\cos ^2 x+\sin x+4})}$अंश और हर को $2 \sin \frac{x}{2}$ से विभाजित करने पर:$L = \lim _{x}$ ${\rightarrow 0} \frac{-\sin \frac{x}{2}(\cos x + 4) - \cos \frac{x}{2}}{\cos \frac{x}{2} (\sqrt{2 \cos ^2 x+3 \cos x}+\sqrt{\cos ^2 x+\sin x+4})}$जब $x \rightarrow 0$,तब $\sin \frac{x}{2} \rightarrow 0$,$\cos \frac{x}{2} \rightarrow 1$,$\cos x \rightarrow 1$:$L = \frac{-(0)(5) - 1}{1 (\sqrt{5} + \sqrt{5})} = -\frac{1}{2 \sqrt{5}}$.

$\lim _{x \rightarrow 0} \operatorname{cosec} x\left(\sqrt{2 \cos ^2 x+3 \cos x}-\sqrt{\cos ^2 x+\sin x+4}\right)$ का मान ज्ञात कीजिए।

Similar Questions

यदि $a = \lim_{x \rightarrow 0} \frac{\sqrt{1+\sqrt{1+x^4}}-\sqrt{2}}{x^4}$ और $b = \lim_{x \rightarrow 0} \frac{\sin^2 x}{\sqrt{2}-\sqrt{1+\cos x}}$ है,तो $ab^3$ का मान ज्ञात कीजिए।

$\mathop {\lim }\limits_{x \to 0} {(1 - ax)^{\frac{1}{x}}} = $

$\lim _{y \rightarrow 0} \frac{\sqrt{3+y^3}-\sqrt{3}}{y^3} = $

$\lim _{x}$ ${\rightarrow \infty} \frac{(2 x+1)^{50}+(2 x+2)^{50}+(2 x+3)^{50}+\cdots \cdots+(2 x+100)^{50}}{(2 x)^{50}+(10)^{50}} = \dots$

यदि $\mathop {\lim }\limits_{x \to a} \frac{{{x^9} + {a^9}}}{{x + a}} = 9$ है,तो $a = $

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