Partial Differentiation, Engineering Mathematics

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if the sides of a triangle ABC vary in such a way that it''s circum-radius remains constant. prove that, da/cos A+db/cos B+dc/cos C =0

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Partial Differentiation, if the sides of a triangle ABC vary in such a way ...

if the sides of a triangle ABC vary in such a way that it''s circum-radius remains constant. prove that, da/cos A+db/cos B+dc/cos C =0

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