Precalculus Examples

$\cos (43.3) = \frac{{21.1}^{2} + {17.9}^{2} - {14.7}^{2}}{2 \cdot 21.1 \cdot 17.9}$

Step 1

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$\cos (43.3) = \frac{{21.1}^{2} + {17.9}^{2} - {14.7}^{2}}{2 \cdot 21.1 \cdot 17.9}$