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यदि रेखायें जिनकी दिक् कोज्यायें al + bm...

यदि रेखायें जिनकी दिक् कोज्यायें `al + bm +cn =0` तथा `fmn + gnl + hlm =0` से दी जाती है, लम्बवत् होगी, तब `f/a + g/b + h/c` बराबर है -

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