Вычислитеsin50+sin10/cos25cos5+sin25sin5

Question

Вычислите
sin50+sin10/cos25cos5+sin25sin5

Answer 1

1)sin50+sin10=2*sin((50+10)/2)*cos((50-10)/)=2*sin30*cos20=cos20
2)cos25cos5+sin25sin5=cos(25-5)=cos20
3) cos20/cos20=1