sin(3π/2 - a) + sin(3π/2 + a) =
= -cos(a) - cos(a) = -2cos(a) = -2•(1/4) =
= -1/2 = -0.5 → ответ.
Удачи Вам и успехов)!
sin(3π/2 - a) + sin(3π/2 + a) =
= -cos(a) - cos(a) = -2cos(a) = -2•(1/4) =
= -1/2 = -0.5 → ответ.
Удачи Вам и успехов)!