જો $\theta \in \left(0, \frac{\pi}{2}\right)$ હોય,તો $\left|\begin{array}{ccc} (\sin \theta+\operatorname{cosec} \theta)^2 & (\sin \theta-\operatorname{cosec} \theta)^2 & 2020 \\ (\cos \theta+\sec \theta)^2 & (\cos \theta-\sec \theta)^2 & 2020 \\ (\tan \theta+\cot \theta)^2 & (\tan \theta-\cot \theta)^2 & 2020 \end{array}\right| = $

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    $2020$

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નિશ્ચાયકના ગુણધર્મોનો ઉપયોગ કરીને અને વિસ્તરણ કર્યા વગર સાબિત કરો કે $\left|\begin{array}{lll}x & a & x+a \\ y & b & y+b \\ z & c & z+c\end{array}\right|=0$.

જો $a \neq b \neq c$,$\Delta_1=\left|\begin{array}{lll}1 & a^2 & b c \\ 1 & b^2 & c a \\ 1 & c^2 & a b\end{array}\right|$,$\Delta_2=\left|\begin{array}{ccc}1 & 1 & 1 \\ a^2 & b^2 & c^2 \\ a^3 & b^3 & c^3\end{array}\right|$ અને $\frac{\Delta_1}{\Delta_2}=\frac{6}{11}$ હોય,તો $11(a+b+c)=$

$\left| \begin{array}{ccc} 11 & 12 & 13 \\ 12 & 13 & 14 \\ 13 & 14 & 15 \end{array} \right| = $

જો $a \ne p, b \ne q, c \ne r$ અને $\begin{vmatrix} p & b & c \\ p + a & q + b & 2c \\ a & b & r \end{vmatrix} = 0$ હોય,તો $\frac{p}{p - a} + \frac{q}{q - b} + \frac{r}{r - c} = $

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નિશ્ચાયકના ગુણધર્મોનો ઉપયોગ કરીને સાબિત કરો કે:
$\left|\begin{array}{ccc}a^{2}+1 & a b & a c \\ a b & b^{2}+1 & b c \\ c a & c b & c^{2}+1\end{array}\right|=1+a^{2}+b^{2}+c^{2}$

Difficult
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