Question

18sin117градус•cos117градус/sin234градус

Answer 1

$\frac{18 \sin(117) \times \cos(117) }{ \sin(234) } = \frac{9 \times 2 \sin(117) \cos(117) }{ \sin(234) } = \\ = \frac{9 \sin(234) }{ \sin(234) } = 9$