જો $\begin{vmatrix} x^2+x & x+1 & x-2 \\ 2x^2+3x-1 & 3x & 3x-3 \\ x^2+2x+3 & 2x-1 & 2x-1 \end{vmatrix} = xA+B$,જ્યાં $A$ અને $B$ એ $3$ ક્રમના નિશ્ચાયકો છે જેમાં $x$ નો સમાવેશ થતો નથી,તો $|A|=$

  • A
    $18$
  • B
    $24$
  • C
    $19$
  • D
    $-8$

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શ્રેણિક $A = \begin{bmatrix} 2 & 3 & 1 & 4 \\ 0 & 1 & 2 & -1 \\ 0 & -2 & -4 & 2 \end{bmatrix}$ નો નિશ્ચાયક (rank) શોધો.

Difficult
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ધારો કે $f(x) = \left| \begin{array}{ccc} \cos x & x & 1 \\ 2 \sin x & x^3 & 2x \\ \tan x & x & 1 \end{array} \right|$. તો $\lim_{x \rightarrow 0} \frac{f(x)}{x^2}$ ની કિંમત શોધો.

જો $f(x) = \left| \begin{array}{ccc} 2\cos^2 2x & \sin 2x & -\sin x \\ \sin 2x & 2\sin^2 x & \cos x \\ \sin x & -\cos x & 0 \end{array} \right|$ હોય,તો $\int_{0}^{\frac{\pi}{2}} f'(x) \,dx$ ની કિંમત શોધો.

જો $f(x) = \left| \begin{array}{ccc} x^3 - x & a + x & b + x \\ x - a & x^2 - x & c + x \\ x - b & x - c & 0 \end{array} \right|$ હોય,તો:

જો $y = \begin{vmatrix} f(x) & g(x) & h(x) \\ l & m & n \\ a & b & c \end{vmatrix}$ હોય,તો સાબિત કરો કે $\frac{dy}{dx} = \begin{vmatrix} f'(x) & g'(x) & h'(x) \\ l & m & n \\ a & b & c \end{vmatrix}$.

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