Question

чему равняется sin(180°-a)? cos(180°-a)?​

Answer 1

sin(180°-a) = sin(180°)cos(a) - cos(180°)sin(a) = 0*cos(a) - (-1)*sin(a) = sin(a)

cos(180°-a) = cos(180°)cos(a) + sin(180°)sin(a) = (-1)cos(a) + 0sin(a) = -cos(a)