(i) If the cosines of two angles of...
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(i) If the cosines of two angles of a triangle are proportional to the opposite sides, show that the triangle is isosceles.

JEE/Engineering Exams
Maths
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[ begin{array}{l}a cos A=b cos ^{N} frac{a}{b}=frac{sin A}{sin B}=frac{cos A}{cos B} # sin (A-B)=sin A cos B-C O A A sin B=0end{array} ] ( A=B ) and ( 50 quad A+B+C=2 A+C=pi ) ( therefore ) The ( triangle ) is inceles
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