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Question Number 114514 by mohammad17 last updated on 19/Sep/20

Commented by bobhans last updated on 19/Sep/20

$$\left(B\right)\overrightarrow{u}.\overrightarrow{v}=\mid \overrightarrow{u}\mid .\mid \overrightarrow{v}\mid \iff \cos \alpha =1$$$$\alpha =0°$$

Commented by mohammad17 last updated on 19/Sep/20

$$wow!thankyousir$$

Answered by bobhans last updated on 19/Sep/20

$$\left(A\right)\overrightarrow{a}.\overrightarrow{b}=\mid \overrightarrow{a}\times \overrightarrow{b}\mid$$$$\mid \overrightarrow{a}\mid .\mid \overrightarrow{b}\mid .\cos \alpha =\mid \overrightarrow{a}\mid .\mid \overrightarrow{b}\mid .\sin \alpha$$$$\to \tan \alpha =1;a=\frac{\pi }{4},\frac{3\pi }{4}$$

Commented by bobhans last updated on 19/Sep/20

$$gavekudos...$$

Commented by mohammad17 last updated on 19/Sep/20

$$thankyousircanyouhelpmein\left(B\right)please$$

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