The side c of a triangle is determined by measuring the sides a, b and angle C. If the small changes in the sides and angle are given by da, db, dc and dC respectively, then show that: dc=cos B da+ços Adb+a sin B dC.

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Fundamentals of Trigonometric Identities

Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.