알려 진 cos (x + pi 4) = 45, x * 8712 (− pi 4, 0), 즉 sinx =...

알려 진 cos (x + pi 4) = 45, x * 8712 (− pi 4, 0), 즉 sinx =...

8757: x * 8712 (8722) pi 4, 0) 8756 < x + pi 4 < pi 4 ∴ sin (x + pi 4) = 1 − 1625 = 35 ∴ sinx = sin (x + pi 4 - pi 4) = sin (x + pi 4) = sin (x + pi 4) cos - cos (x + pi 4) sin pi 4 = 210 그러므로 정 답: 210