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

abhishek , 9 Years ago
Grade 11
anser 1 Answers
Lab Bhattacharjee

Last Activity: 9 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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