Question
$4{\sin ^2}x + 3{\cos ^2}x$ का अधिकतम मान होगा
$\therefore $ ${\sin ^2}x + 3$ का अधिकतम मान 4 है।
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$(A)$ $\left(\frac{1}{3}, \frac{1}{\sqrt{3}}\right)$
$(B)$ $\left(\frac{1}{4}, \frac{1}{2}\right)$
$(C)$ $\left(\frac{1}{3},-\frac{1}{\sqrt{3}}\right)$
$(D)$ $\left(\frac{1}{4},-\frac{1}{2}\right)$