Question

Sin 2x - √2 sin x = 0 ?? (0 ≤ x < 360)

Answer 1

Sin 2x - √2 sin x = 0
2 sin x cos x - √2 sin x = 0
sin x(2 cos x - √2) = 0
sin x = 0 atau 2 cos x - √2 = 0 ===> cos x =

sin x = 0
sin x = sin 0
x = 0 + k.360
untuk k = 0 ==> x = 0
atau sin x = sin 0
x = (180 - 0) + k.360
untuk k = 0 ===> x = 180

cos x =
cos x = cos 45
x = 45 + k .360...
dst caranya sama...