Question
Using the Sine rule, prove the Cosine rule.
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$\int_0^2 e^x d x$
and $\mathrm{fmn}+\mathrm{gnl}+\mathrm{hlm}=0$ are perpendicular if $\frac{f}{a}+\frac{g}{b}+\frac{h}{c}=0$
vectors $\hat{4}-\hat{j}+3 \hat{k}$ and $\hat{i}+\hat{j}+\hat{k}$.