Question

значение выражения 21√6 tg 13π/6 sin 3π/4

Answer 1

$21 \sqrt{6} \tan( \frac{13\pi}{6} ) \sin( \frac{3\pi}{4} ) = 21 \sqrt{6} \times \frac{ \sqrt{3} }{3} \times \frac{ \sqrt{2} }{2} = \frac{21 \sqrt{6} \times \sqrt{6} }{6} = \frac{21 \times 6}{6} = 21$