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यदि एक समान्तर चतुर्भुज की संलग्न भुजाएँ...

यदि एक समान्तर चतुर्भुज की संलग्न भुजाएँ `bara = 3hati + hatj + 4hatk` तथा `barb = hati -hatj + hatk` हैं तो उस समान्तर चतुर्भुज का क्षेत्रफल ज्ञात कीजिए

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