In any triangle,

MATHEMATICS · Single correct · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

In any triangle, 1+cos⁡(A−B)cos⁡C1+cos⁡(A−C)cos⁡B=\frac{1+\cos(A-B)\cos C}{1+\cos(A-C)\cos B}= (1) a2+b2a2+c2\frac{a^2+b^2}{a^2+c^2} (2) b2+c2b2−c2\frac{b^2+c^2}{b^2-c^2} (3) c2−a2a2+b2\frac{c^2-a^2}{a^2+b^2} (4) None of these

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