InterviewSolution
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In ` A B C ,=`if `(a+b+c)(a-b+c)=3a c ,`then find `/_Bdot` |
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Answer» We have `(a + c)^(2) - b^(2) = 3ac` or `a^(2) + c^(2) - b^(2) = ac` But `cos B = (a^(2) + c^(2) -b^(2))/(2 ac) = (1)/(2)` So, `B = (pi)/(3)` |
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