2. If C= 60°, show that, 2a - b = 2...
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2. If C= 60°, show that, 2a - b = 2ccos B

JEE/Engineering Exams
Maths
Solution
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Projection founula [ begin{array}{r}e cos B+b cos C=a A=60^{circ} quad cos C=frac{1}{2} c cos B+frac{b}{2}=aend{array} ] ( therefore 2 cos B=2 a-b )
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