Number of θ ∈(0,4 π) for which system of linear equations 3(sin 3 θ) x-y+z=2 , 3(cos 2 θ) x+4

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3 and 4 .Determinants and Matrices

hard

The number of $\theta \in(0,4 \pi)$ for which the system of linear equations

$3(\sin 3 \theta) x-y+z=2$, $3(\cos 2 \theta) x+4 y+3 z=3$, $6 x+7 y+7 z=9$ has no solution is.

$6$

$7$

$8$

$9$

(JEE MAIN-2022)

Solution

The system of equation has no solution.

$D=\left|\begin{array}{ccc}3 \sin 3 \theta & -1 & 1 \\3 \cos 2 \theta & 4 & 3 \\6 & 7 & 7\end{array}\right|=0$$21 \sin 3 \theta+42 \cos 2 \theta-42=0$$\sin 3 \theta+2 \cos 2 \theta-2=0$

Number of solution is $7$ in $(0,4 \pi)$

Standard 12

Mathematics

The number of distinct real roots of $\left| {\,\begin{array}{*{20}{c}}{\sin x}&{\cos x}&{\cos x}\\{\cos x}&{\sin x}&{\cos x}\\{\cos x}&{\cos x}&{\sin x}\end{array}\,} \right| = 0$ in the interval $ – \frac{\pi }{4} \le x \le \frac{\pi }{4}$ is

medium

(IIT-2001)

Let $\alpha, \beta(\alpha \neq \beta)$ be the values of $m$, for which the equations $x+y+z=1 ; x+2 y+4 z=m$ and $x+4 y+10 z=m^2$ have infinitely many solutions. Then the value of $\sum_{n=1}^{10}\left(n^\alpha+n^\beta\right)$ is equal to :

hard

(JEE MAIN-2025)

Let $\mathrm{A}(-1,1)$ and $\mathrm{B}(2,3)$ be two points and $\mathrm{P}$ be a variable point above the line $A B$ such that the area of $\triangle \mathrm{PAB}$ is $10$ . If the locus of $\mathrm{P}$ is $\mathrm{ax}+\mathrm{by}=15$, then $5 a+2 b$ is :

hard

(JEE MAIN-2024)

Consider the following system of questions $\alpha x+2 y+z=1$ ; $2 \alpha x+3 y+z=1$ ; $3 x+\alpha y+2 z=\beta$ . For some $\alpha, \beta \in R$. Then which of the following is NOT correct.

hard

(JEE MAIN-2023)

$\left| {\,\begin{array}{*{20}{c}}{{{({a^x} + {a^{ – x}})}^2}}&{{{({a^x} – {a^{ – x}})}^2}}&1\\{{{({b^x} + {b^{ – x}})}^2}}&{{{({b^x} – {b^{ – x}})}^2}}&1\\{{{({c^x} + {c^{ – x}})}^2}}&{{{({c^x} – {c^{ – x}})}^2}}&1\end{array}\,} \right| = $

easy

The number of $\theta \in(0,4 \pi)$ for which the system of linear equations $3(\sin 3 \theta) x-y+z=2$, $3(\cos 2 \theta) x+4 y+3 z=3$, $6 x+7 y+7 z=9$ has no solution is.

Solution

Similar Questions

The number of distinct real roots of $\left| {\,\begin{array}{*{20}{c}}{\sin x}&{\cos x}&{\cos x}\\{\cos x}&{\sin x}&{\cos x}\\{\cos x}&{\cos x}&{\sin x}\end{array}\,} \right| = 0$ in the interval $ – \frac{\pi }{4} \le x \le \frac{\pi }{4}$ is

Let $\alpha, \beta(\alpha \neq \beta)$ be the values of $m$, for which the equations $x+y+z=1 ; x+2 y+4 z=m$ and $x+4 y+10 z=m^2$ have infinitely many solutions. Then the value of $\sum_{n=1}^{10}\left(n^\alpha+n^\beta\right)$ is equal to :

Let $\mathrm{A}(-1,1)$ and $\mathrm{B}(2,3)$ be two points and $\mathrm{P}$ be a variable point above the line $A B$ such that the area of $\triangle \mathrm{PAB}$ is $10$ . If the locus of $\mathrm{P}$ is $\mathrm{ax}+\mathrm{by}=15$, then $5 a+2 b$ is :

Consider the following system of questions $\alpha x+2 y+z=1$ ; $2 \alpha x+3 y+z=1$ ; $3 x+\alpha y+2 z=\beta$ . For some $\alpha, \beta \in R$. Then which of the following is NOT correct.

$\left| {\,\begin{array}{*{20}{c}}{{{({a^x} + {a^{ – x}})}^2}}&{{{({a^x} – {a^{ – x}})}^2}}&1\\{{{({b^x} + {b^{ – x}})}^2}}&{{{({b^x} – {b^{ – x}})}^2}}&1\\{{{({c^x} + {c^{ – x}})}^2}}&{{{({c^x} – {c^{ – x}})}^2}}&1\end{array}\,} \right| = $

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The number of $\theta \in(0,4 \pi)$ for which the system of linear equations

$3(\sin 3 \theta) x-y+z=2$, $3(\cos 2 \theta) x+4 y+3 z=3$, $6 x+7 y+7 z=9$ has no solution is.