Write 'True' or 'False' and justify your answer.
The value of $2 \sin \theta$ can be $(a + \frac{1}{a}),$ where $a$ is a positive number,and $a \neq 1$.

Vedclass pdf generator app on play store
Vedclass iOS app on app store
(B) False.
Given that $a$ is a positive number and $a \neq 1,$ we apply the Arithmetic Mean-Geometric Mean $(AM-GM)$ inequality.
For any two positive numbers $a$ and $\frac{1}{a},$ the $AM$ is $\frac{a + \frac{1}{a}}{2}$ and the $GM$ is $\sqrt{a \cdot \frac{1}{a}} = 1.$
Since $AM > GM$ for $a \neq 1,$ we have $\frac{a + \frac{1}{a}}{2} > 1,$ which implies $(a + \frac{1}{a}) > 2.$
If we assume $2 \sin \theta = a + \frac{1}{a},$ then $2 \sin \theta > 2,$ which means $\sin \theta > 1.$
However,we know that the range of $\sin \theta$ is $[-1, 1],$ so $\sin \theta$ can never be greater than $1.$
Therefore,the statement is False.

Explore More

Similar Questions

The simplification of $\frac{\cos (90^{\circ}- A ) \sin (90^{\circ}- A )}{\tan (90^{\circ}- A )}$ is .......

If $\cos A = \frac{4}{5}$,then the value of $\tan A$ is

For acute angle $\theta,$ if $\cos \theta = \sin \theta,$ then $2 \tan^{2} \theta + \sin^{2} \theta + 1 = \ldots$

$\cos (40^{\circ}-\theta)-\sin (50^{\circ}+\theta) = \ldots \ldots \ldots \ldots$

Write 'True' or 'False' and justify your answer.
$\cos \theta = \frac{a^{2} + b^{2}}{2ab}$,where $a$ and $b$ are two distinct numbers such that $ab > 0$.

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo