Question

Помогите пожалуйста.

Answer 1

1) sin(π/6)cos(π/3) - 2sin(4π/3) + cos(π/6)sin(π/3) = sin(π/6 + π/3) - 2sin(4π/3) = sin(π/2) - 2sin(4π/3) = 1 - 2*(-√3/2) = 1 + √3

2) sin39°sin(90°-51°)+cos39°sin51° - 5,7 = sin39°cos51°+cos39°sin51° - 5,7 = sin(39°+51°) - 5,7 = 1 - 5,7 = -4,7