Question

Срочно! Номер 215 и 219

Answer 1

$215)frac{19Sin17^{o}*Sin73^{o}}{Cos236^{o}}=frac{19Sin17^{o}*Sin(90^{o}-17^{o})}{Cos(270^{o}-34^{o})}=frac{19Sin17^{o}Cos17^{o}}{-Sin34^{o} }=frac{9,5Sin34^{o} }{-Sin34^{o} }=-9,5$

$219)frac{frac{8Sinalpha }{Cosalpha}-frac{9Cosalpha }{Cosalpha}}{frac{6Cosalpha }{Cosalpha}-frac{7Sinalpha }{Cosalpha}}=frac{8tgalpha-9 }{6-7tgalpha }=frac{8*2-9}{6-7*2}=frac{16-9}{6-14}=frac{7}{-8}=-0,875$

Answer 2

Благодарю!