Question
रेखाओं $r = {a_1} + \lambda {a_2}$ और $r = {a_2} + \lambda {a_1}$ को सम्मिलित करने वाले समतल का समीकरण है
$\therefore $ $(r - {a_1}).({a_1} \times {a_2}) = 0$
$\Rightarrow [r\,\,{a_1}\,{a_2}]$=$[{a_1}\,{a_1}\,{a_2}] \Rightarrow [r\,{a_1}\,{a_2}] = 0$
अत:, अभीष्ट समतल $[r\,\,{a_1}\,{a_2}] = 0$ है।
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