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How do you solve the trigonomic equation sin2x equals negative cosx?
Wiki User
∙ 13y ago
Sin(2x) = -cos(x)
But sin(2x) = 2 sin(x) cos(x)
Substitute it:
2 sin(x) cos(x) = -cos(x)
Divide each side by cos(x):
2 sin(x) = -1
sin(x) = -1/2
x = 210°
x = 330°
Wiki User
∙ 13y ago
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