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Determine the measure of angle A if 0 degrees is smaller than or equal to A which is smaller than or equal to 90 degrees and cos125 degrees equals negative cos A?
Wiki User
∙ 10y ago
cos(125) = cos(180 - 55) = cos(180)*cos(55) + sin(180)*sin(55)
= -cos(55) since cos(180) = -1, and sin(180) = 0
So A = 55 degrees.
Wiki User
∙ 10y ago
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