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Grade 11Trigonometry

IN TRIANGLE ABC 2acsin1/2(A-B+C)=

Profile image of abhishek
10 Years agoGrade 11
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1 Answer

Profile image of Lab Bhattacharjee
10 Years ago
A-B+C=\pi-2B\\ \implies\sin\dfrac{A-B+C}2=\cos B\\ \text{Now, }\cos B=\dfrac{c^2+a^2-b^2}{2ca}

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