Easy MCQ +4 / -1 PYQ · JEE Mains 2024

Let $f(x)=\frac{1}{7-\sin 5 x}$ be a function defined on $\mathbf{R}$. Then the range of the function $f(x)$ is equal to :

  1. A $\left[\frac{1}{8}, \frac{1}{5}\right]$
  2. B $\left[\frac{1}{7}, \frac{1}{6}\right]$
  3. C $\left[\frac{1}{7}, \frac{1}{5}\right]$
  4. D $\left[\frac{1}{8}, \frac{1}{6}\right]$ Correct answer

Solution

<p>$$\begin{aligned} & f(x)=\frac{1}{7-\sin 5 x} \\\\ & -1 \leq \sin 5 x \leq 1 \\\\ & -1 \leq-\sin 5 x \leq 1 \\\\ & -1+7 \leq 7-\sin 5 x \leq 1+7 \\\\ & 6 \leq 7-\sin 5 x \leq 8 \\\\ & \frac{1}{8} \leq \frac{1}{7-\sin 5 x} \leq \frac{1}{6} \\\\ & \frac{1}{8} \leq f(x) \leq \frac{1}{6} \\\\ & \text { Range }=\left[\frac{1}{8}, \frac{1}{6}\right] \end{aligned}$$</p>

About this question

Subject: Mathematics · Chapter: Sets, Relations and Functions · Topic: Sets and Operations

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