If we reduce \( 3 x+3 y+7=0 \) to the form \( x \cos \alpha+y \sin \alpha \) \( =p \), then the ...

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If we reduce \( 3 x+3 y+7=0 \) to the form \( x \cos \alpha+y \sin \alpha \) \( =p \), then the value of \( p \) is
(a) \( \frac{7}{2 \sqrt{3}} \)
(b) \( \frac{7}{3} \)
(c) \( \frac{3 \sqrt{7}}{2} \)
(d) \( \frac{7}{3 \sqrt{2}} \)
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