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सिद्ध कीजिए कि सम्मिश्र संख्याओं `z,iz` तथा `z+iz` द्वारा बने त्रिभुज का क्षेत्रफल `(1)/(2)|z|^(2)` है ।

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`z=x+iy,rArriz=-y+ix` तथा `z+iz=(z-y)+i(z+y)`
`rArr` अब त्रिभुज के क्षेत्रफल का सूत्र लगाने पर

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