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যদিও ( overrightarrow P ~ও~ overrightarrow Q ) ভেক্টরদ্বয় সমান্তরাল হয়- i. ( vec P times vec Q =0 ) ii. ( P_ x Q_ x +P_ y Q_ y +P_ z Q_ z =0 ) iii. ( frac P_ x Q_ x = frac P_ y Q_ | Suva Ai