∣(x−y)f(x)−f(y)∣≤∣(x−y)∣Let x−y=h
⇒x=y+h
x→0lim∣hf(y+h)−f(y)∣≤0
⇒∣f′(y)∣≤0⇒f′(y)=0
⇒f(y)=k (constant)
And f(0)=1 given
So, f(y)=1⇒f(x)=1
JEE Main 2021 — Mathematics Calculus
Let f be any function defined on R and let it satisfy the condition: ∣f(x)−f(y)∣≤∣(x−y)2∣,∀(x,y)∈R. If f(0)=1, then :
Held on 26 Feb 2021 · Verified 6 Jul 2026.
f(x)=0,∀x∈R
f(x) can take any value in R
f(x)<0,∀x∈R
f(x)>0,∀x∈R
Sign in to track your attempts and accuracy.
Sign in to keep a private note on this question. Nothing you write is ever public.
The value of $\int_{-\pi / 6}^{\pi / 6}\left(\frac{\pi+4 x^{11}}{1-\sin (|x|+\pi / 6)}\right) d x$ is equal to:
The product of all possible values of $\alpha$, for which $\displaystyle\lim_{x \to 0}\left(\dfrac{1 - \cos(\alpha x)\cos((\alpha+1)x)\cos((\alpha+2)x)}{\sin^2((\alpha+1)x)}\right) = 2$, is:
The value of the integral $\displaystyle\int_0^\infty \dfrac{\log_e(x)}{x^2 + 4}\,dx$ is:
Let $f$ be a differentiable function satisfying $f(x)=1-2 x+\int_{0}^{x} \mathrm{e}^{(x-t)} f(t) \mathrm{dt}, x \in \mathbf{R}$ and let $\mathrm{g}(x)=\int_{0}^{x}(f(\mathrm{t})+2)^{15}(\mathrm{t}-4)^{6}(\mathrm{t}+12)^{17} \mathrm{dt}, x \in \mathbf{R}$. If p and q are respectively the points of local minima and local maxima of g, then the value of $|\mathrm{p}+\mathrm{q}|$ is equal to $\_\_\_\_$.
Let the area of the region bounded by the curve $y=\max \{\sin x, \cos x\}$, lines $x=0, x=\frac{3 \pi}{2}$, and the $x$-axis be A. Then, $\mathrm{A}+\mathrm{A}^{2}$ is equal to $\_\_\_\_$.
Work through every JEE Main Calculus PYQ, year by year.