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Latex demo


$$(क)\ \frac{a}{a-b} + \frac{b}{b-a}$$    $$\ \frac{a}{a-b} + \frac{b}{-(a-b)} $$ $$(ख)\ \frac{1}{b-c} + \frac{b+c}{b^2-c^2} $$ $$ (ग)\ \frac{1}{m-n} + \…
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