જો $a$ એ $b$ અને $c$ બંનેને લંબ સદિશ હોય,તો

  • A
    $a \cdot (b \times c) = 0$
  • B
    $a \times (b \times c) = 0$
  • C
    $a \times (b + c) = 0$
  • D
    $a + (b + c) = 0$

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ધારો કે $\overrightarrow{a}=2 \hat{i}-3 \hat{j}+4 \hat{k}$,$\overrightarrow{b}=3 \hat{i}+4 \hat{j}-5 \hat{k}$,અને સદિશ $\vec{c}$ એવો છે કે $\vec{a} \times(\vec{b}+\vec{c})+\vec{b} \times \vec{c}=\hat{i}+8 \hat{j}+13 \hat{k}$. જો $\vec{a} \cdot \vec{c}=13$ હોય,તો $(24-\vec{b} \cdot \vec{c})$ ની કિંમત ........... થાય.

જો $\bar{x} \cdot \bar{y} = 0$ હોય,તો $\bar{x} \times (\bar{x} \times \bar{y}) = \dots$ જ્યાં $|\bar{x}| = 1$.

જો $\vec{a}, \vec{b}, \vec{c}$ એ $\sqrt{3}, 1, 2$ મૂલ્યના ત્રણ સદિશો છે,જેથી $\vec{a} \times (\vec{a} \times \vec{c}) + 3\vec{b} = \vec{0}$. જો $\vec{a}$ અને $\vec{c}$ વચ્ચેનો ખૂણો $\theta$ હોય,તો $\cos^2 \theta = $

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$(\vec{a} \times \vec{b}) \times [(\vec{b} \times \vec{c}) \times (\vec{a} \times \vec{b} + \vec{b} \times \vec{c} + \vec{c} \times \vec{a})]$ શું છે?

જો $\vec{a}=\hat{i}+\hat{j}+\hat{k}$,$\vec{b}=-\hat{i}+2\hat{j}-2\hat{k}$ અને $\vec{c}=2\hat{i}-\hat{j}+2\hat{k}$ હોય,તો $(\vec{a}-\vec{b}) \cdot [(\vec{a} \times \vec{b}) \times (\vec{a} \times \vec{c})]$ ની કિંમત શોધો.

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