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OpenStudy (anonymous):
Given a triangle with b=4, c=10, and A=84*, what is the length of a? Round to the nearest tenth. I know you have to use the law of cosines, but i am really confused on how to do this.
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OpenStudy (kc_kennylau):
\[a^2=b^2+c^2-2bc\cos(A)\] \[a^2=116-80\cos(84)\] \[a=10.375\]
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