Scalene triangle

Solve the triangle:

A = 50°, b = 13, c = 6

Correct result:

a =  10.23

Solution:

$a=\sqrt{13^2+6^2-2\cdot 13\cdot 6\cdot \cos 50^{\circ }}=\cos 5\pi \mathrm{/}18=0=10.23$

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