$\theta \in (0, \pi /3)$ का एक मान,जिसके लिए $\left| \begin{array}{ccc} 1 + \cos^2 \theta & \sin^2 \theta & 4 \cos 6\theta \\ \cos^2 \theta & 1 + \sin^2 \theta & 4 \cos 6\theta \\ \cos^2 \theta & \sin^2 \theta & 1 + 4 \cos 6\theta \end{array} \right| = 0$ है,वह है

  • A
    $\frac{\pi }{18}$
  • B
    $\frac{\pi }{9}$
  • C
    $\frac{7\pi }{36}$
  • D
    $\frac{7\pi }{24}$

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यदि $a \neq p, b \neq q, c \neq r$ और $\left|\begin{array}{ccc}p & b & c \\ p+a & q+b & 2c \\ a & b & r\end{array}\right|=0$ है, तो $\frac{p}{p-a}+\frac{q}{q-b}+\frac{r}{r-c}$ का मान ज्ञात कीजिए :

$\left| {\begin{array}{ccc} 1/a & a^2 & bc \\ 1/b & b^2 & ca \\ 1/c & c^2 & ab \end{array}} \right| = $

$\left|\begin{array}{ccc}a & b & c \\ a^2 & b^2 & c^2 \\ 1 & 1 & 1\end{array}\right|$ किसके बराबर नहीं है?

यदि $\Delta _1 = \left| \begin{matrix} b^5c^6(c^3 - b^3) & a^4c^6(a^3 - c^3) & a^4b^5(b^3 - a^3) \\ b^2c^3(b^6 - c^6) & ac^3(c^6 - a^6) & ab^2(a^6 - b^6) \\ b^2c^3(c^3 - b^3) & ac^3(a^3 - c^3) & ab^2(b^3 - a^3) \end{matrix} \right|$ और $\Delta _2 = \left| \begin{matrix} a & b^2 & c^3 \\ a^4 & b^5 & c^6 \\ a^7 & b^8 & c^9 \end{matrix} \right|$ है,तो $\Delta _1 \Delta _2$ का मान ज्ञात कीजिए।

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यदि $A$,$3 \times 3$ कोटि का एक वर्ग आव्यूह है,तो $|KA|$ किसके बराबर है?

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