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jak7ha2Girlbellacno
jak7ha2Girlbellacno jak7ha2Girlbellacno
  • 19-08-2016
  • Mathematics
Answered

in ∆abc, what is the value of cos b?

Verified Answer :

dalendrk
dalendrk dalendrk
  • 20-08-2016

\(c^2=a^2+b^2-2ab\cos\beta\\\\2ab\cos\beta=a^2+b^2-c^2\\\\\boxed{\cos\beta=\dfrac{a^2+b^2-c^2}{2ab}}\)

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