Сократите дробь:
1) [tex] \frac{sin80}{sin40} [/tex]
2) [tex] \frac{sin110}{cos35} [/tex]
1) [tex] \frac{sin80}{sin40} [/tex]
2) [tex] \frac{sin110}{cos35} [/tex]
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Answers & Comments
2)sin110°/cos35°=sin2.55°/cos35°=2.sin55°cos55°/sin(90°-35°)=
=2.sin55°cos55°/sin55°=2.cos55°