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उस समांतर चतुर्भुज का क्षेत्रफल ज्ञात की...

उस समांतर चतुर्भुज का क्षेत्रफल ज्ञात कीजिए जिसकी दो संलग्न भुजाएँ सदिशों `hati+2hatj+3hatk` तथा `3hati-2hatj+hatk` से निरूपित हैं।

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Calculate the values of (i) hatj. (2hati - 3hatj +hatk) and (ii) (2hati - hatj) (3hati + hatk)