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वह शर्त ज्ञात कीजिए जिससे `( veca * vecb)^(2) = a^(2)b^(2)` होगा |

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`veca * vecb = ab cos theta`
`therefore ( veca * vecb)^(2) = a^(2)b^(2) cos^(2) theta`
यहाँ `(veca * vecb)^(2) = a^(2)b^(2)` होगा जब `cos theta =1` अर्थात `theta = 0, veca` तथा `vecb` समान्तर होंगे |

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