In vector diagram shown in figure where \( (\overrightarrow{\mathrm...

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In vector diagram shown in figure where \( (\overrightarrow{\mathrm{R}}) \) is the resultant of vectors \( (\vec{A}) \) and \( (\vec{B}) \).
If \( \mathrm{R}=\frac{\mathrm{B}}{\sqrt{2}} \), then value of angle \( \theta \) is :
(1) \( 30^{\circ} \)
(2) \( 45^{\circ} \)
(3) \( 60^{\circ} \)
(4) \( 75^{\circ} \)
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I have doubt why we choose sin Theta^ here ham cos theta^ bhi to likh skte us se nhi hoga

vaishnavitiwari