Scalene triangle

Solve the triangle:

A = 50°, b = 13, c = 6

Correct result:

a =  10.23

Solution:

a=132+62−2⋅ 13⋅ 6⋅ cos⁡50∘=cos⁡5π/18=0=10.23a=\sqrt{ 13^{ 2 }+6^{ 2 }-2 \cdot \ 13 \cdot \ 6 \cdot \ \cos 50 ^\circ }=\cos 5π/18=0=10.23

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