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Will you show the work?

Will you show the work?-example-1
User AngelaG
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\textit{Law of Cosines}\\\\ \cfrac{a^2+b^2-c^2}{2ab}=\cos(C)\implies \cos^(-1)\left(\cfrac{a^2+b^2-c^2}{2ab}\right)=\measuredangle C \\\\[-0.35em] ~\dotfill\\\\ \cos^(-1)\left(\cfrac{30^2+24^2-13^2}{2(30)(24)}\right)=\measuredangle A \implies \cos^(-1)\left(\cfrac{ 1307 }{ 1440 }\right)=\measuredangle A \\\\\\ \cos^(-1)(0.9076389) \approx \measuredangle A \implies 24.8189^o \approx \measuredangle A

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User StrongBad
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