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Jan 19, 2014 at 21:24 comment added Felix Marin @Andrew I agree. It should be solved in some different way. That's is enough for the OP to try himself. Thanks.
Jan 19, 2014 at 12:07 comment added Andrew If $ca=b$ then the denominator turns into zero.
Jan 19, 2014 at 8:16 history answered Felix Marin CC BY-SA 3.0