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11TH · MATH

Question 11

menu_bookSolutionmenu_bookTheorymenu_book•(i)b=ccos⁡A+acos⁡Cb = c\cos A + a\cos Cb=ccosA+acosCmenu_book•(ii)c=acos⁡B+bcos⁡Ac = a\cos B + b\cos Ac=acosB+bcosAmenu_book•(iii)b2=c2+a2−2cacos⁡Bb^2 = c^2 + a^2 - 2ca\cos Bb2=c2+a2−2cacosBmenu_book•(iv)c2=a2+b2−2abcos⁡Cc^2 = a^2 + b^2 - 2ab\cos Cc2=a2+b2−2abcosC
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11TH · MATH

Question 11

menu_bookSolutionmenu_bookTheorymenu_book•(i)b=ccos⁡A+acos⁡Cb = c\cos A + a\cos Cb=ccosA+acosCmenu_book•(ii)c=acos⁡B+bcos⁡Ac = a\cos B + b\cos Ac=acosB+bcosAmenu_book•(iii)b2=c2+a2−2cacos⁡Bb^2 = c^2 + a^2 - 2ca\cos Bb2=c2+a2−2cacosBmenu_book•(iv)c2=a2+b2−2abcos⁡Cc^2 = a^2 + b^2 - 2ab\cos Cc2=a2+b2−2abcosC
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