सिद्ध कीजिए कि रेखायें \( x+3 y+2=0 \) और \( 3 x-y=0 \) एक-दूसरे के लम्बवत् हैं।

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सिद्ध कीजिए कि रेखायें \( x+3 y+2=0 \) और \( 3 x-y=0 \) एक-दूसरे के लम्बवत् हैं।
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