Find the derivative of $(x^2 + 1)\, cos\, x$.
- $2x\, cos \,x - (x^2 + 1) sin \,x$
- $2x \,sin\, x - x^2 \,cos\, x$
- $x^{2}\left(cos\,x-sin\,x\right)$
- $2x(sin\, x + cos\, x)$
The Correct Option is A
Solution and Explanation
Top Questions on limits and derivatives
Let $\left\lfloor t \right\rfloor$ be the greatest integer less than or equal to $t$. Then the least value of $p \in \mathbb{N}$ for which
\[ \lim_{x \to 0^+} \left( x \left\lfloor \frac{1}{x} \right\rfloor + \left\lfloor \frac{2}{x} \right\rfloor + \dots + \left\lfloor \frac{p}{x} \right\rfloor \right) - x^2 \left( \left\lfloor \frac{1}{x^2} \right\rfloor + \left\lfloor \frac{2}{x^2} \right\rfloor + \dots + \left\lfloor \frac{9^2}{x^2} \right\rfloor \right) \geq 1 \]
is equal to __________.
- JEE Main - 2025
- Mathematics
- limits and derivatives
- Let the function \( g: (-\infty, 0) \rightarrow \left(-\frac{\pi}{2}, \frac{\pi}{2}\right) \) be given by \( g(u) = 2 \tan^{-1}(e^u) - \frac{\pi}{2} \). Determine the properties of \( g \).
- BITSAT - 2024
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- limits and derivatives
- Let \( f \) be the function defined by:
\[ f(x) = \begin{cases} \frac{x^2 - 1}{x^2 - 2|x-1| - 1}, & \text{if } x \neq 1, \\ \frac{1}{2}, & \text{if } x = 1. \end{cases} \] The function is continuous at:- BITSAT - 2024
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- Let \( f(x) = x^2 \log(\cos x) \log(1 + x) \) for \( x \neq 0 \), and \( f(0) = 0 \). Determine the behavior of \( f(x) \) at \( x = 0 \).
- BITSAT - 2024
- Mathematics
- limits and derivatives
- If \( f(x) \) is defined as follows:
\[ f(x) = \begin{cases} 4, & {if } -\infty < x < -\sqrt{5}, \\ x^2 - 1, & {if } -\sqrt{5} \leq x \leq \sqrt{5}, \\ 4, & {if } \sqrt{5} \leq x < \infty. \end{cases} \] If \( k \) is the number of points where \( f(x) \) is not differentiable, then \( k - 2 = \)- BITSAT - 2024
- Mathematics
- limits and derivatives
Notes on limits and derivatives
- Value of log Infinity Mathematics
- NCERT Solutions For Class 11 Mathematics Chapter 13 Limits and Derivatives
- Important Questions On Limits and Derivatives Mathematics
- NCERT Solutions for Class 11 Maths Chapter 13 Exercise 13 1
- NCERT Solutions for Class 11 Maths Chapter 13 Exercise 13 2
- NCERT Solutions for Class 11 Maths Chapter 13 Miscellaneous Exercises
Concepts Used:
Limits And Derivatives
Mathematically, a limit is explained as a value that a function approaches as the input, and it produces some value. Limits are essential in calculus and mathematical analysis and are used to define derivatives, integrals, and continuity.
Limits Formula:
Derivatives of a Function:
A derivative is referred to the instantaneous rate of change of a quantity with response to the other. It helps to look into the moment-by-moment nature of an amount. The derivative of a function is shown in the below-given formula.
Properties of Derivatives:
Read More: Limits and Derivatives