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JEE Mains · Maths · STD 12 - 2. inverse trigonometric function

ત્રિકોણમિતીય પ્રતિવિઘેયોની ફક્ત મુખ્ય કિંમતોને ધ્યાને લેતાં, વિઘેય \(f(x)=\cos ^{-1}\left(\frac{x^{2}-4 x+2}{x^{2}+3}\right)\) નો પ્રદેશ .......... છે.

  1. A \(\left(-\infty, \frac{1}{4}\right]\)
  2. B \(\left[-\frac{1}{4}, \infty\right)\)
  3. C \(\left(-\frac{1}{3}, \infty\right)\)
  4. D \(\left(-\infty, \frac{1}{3}\right]\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\left[-\frac{1}{4}, \infty\right)\)

Step-by-step Solution

Detailed explanation

\(\left|\frac{x^{2}+4 x+2}{x^{2}+3}\right| \leq 1\) \(\left(x^{2}-4 x+2\right)^{2} \leq\left(x^{2}+3\right)^{2}\) \(\left(x^{2}-4 x+2\right)^{2}-\left(x^{2}+3\right)^{2} \leq 0\) \(\left(2 x^{2}-4 x+5\right)(-4 x-1) \leq 0\) \(-4 x-1 \leq 0 \rightarrow x \geq-\frac{1}{4}\)
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