Sin(3п/2 -а)+sin(3п/2 +a) есьли cosa=1/4

Question

Sin(3п/2 -а)+sin(3п/2 +a) есьли cosa=1/4

Answer 1

sin(3π/2 - a) + sin(3π/2 + a) =

= -cos(a) - cos(a) = -2cos(a) = -2•(1/4) =

= -1/2 = -0.5 → ответ.

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