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(i) सिद्ध कीजिए कि रेखायें जिनकी दिक् को...

(i) सिद्ध कीजिए कि रेखायें जिनकी दिक् कोज्यायें `l+m+n=0` तथा `3lm-4mn+2nl=0` द्वारा दी गयी है , परस्पर लंबवत है,
(ii) उन रेखाओं के मध्य कोण ज्ञात कीजिए जिनकी दिक् कोज्याये निम्न समीकरणों द्वारा दी गयी है-
(a) `l+m+n=0,0,l^(2)+m^(2)-n^(2)=0`
(b) `l+2m+3n=0,3lm-4ln+mn=0`

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