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उस समांतर चतुर्भुज का क्षेत्रफल ज्ञात की...

उस समांतर चतुर्भुज का क्षेत्रफल ज्ञात कीजिए जिसकी भुजाएं `3hati+2hatj-hatk` और `hati+2hatj+3hatk` है।

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Show that the vectors 4hati-hatj+hatk, 3hati-2hatj-hatk and hati+hatj+2hatk are co-planar.

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