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Solution 4.2:6
From Förberedande kurs i matematik 1
We can work out the length we are looking for by taking the difference
If we take the tangent of the given angle in each triangle, we easily obtain
\displaystyle a=1\centerdot \tan 60^{\circ }=\frac{\sin 60^{\circ }}{\cos 60^{\circ }}=\frac{\frac{\sqrt{3}}{2}}{\frac{1}{2}}=\sqrt{3}