Question

Сократите дробь:
1) $frac{sin80}{sin40}$
2) $frac{sin110}{cos35}$

Answer 1

1)sin80°/sin40²=sin2.40°/sin40°=2.sin40°cos40°/sin40°=2.cos40°
2)sin110°/cos35°=sin2.55°/cos35°=2.sin55°cos55°/sin(90°-35°)=
=2.sin55°cos55°/sin55°=2.cos55°