Question

Срочно! Номер 215 и 219

Answer 1

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

$219)\frac{\frac{8Sin\alpha }{Cos\alpha}-\frac{9Cos\alpha }{Cos\alpha}}{\frac{6Cos\alpha }{Cos\alpha}-\frac{7Sin\alpha }{Cos\alpha}}=\frac{8tg\alpha-9 }{6-7tg\alpha }=\frac{8*2-9}{6-7*2}=\frac{16-9}{6-14}=\frac{7}{-8}=-0,875$