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Given that Sin x equals 0.8 and x is acute write down the value of Cos x?
Wiki User
∙ 14y ago
cos2x = 1 - sin2x = 1 - 0.64 = 0.36
So cos x = +/- 0.6
Since x is acute, cos x is +ve, so cos x = 0.6
Wiki User
∙ 14y ago
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