partial Differentiation, Engineering, Mathematics

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

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

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