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ррррр17
@ррррр17
August 2022
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найдите значение выражения 2-4sin в квадрате x, если cosx = 3/4
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veronika472
2 - 4sin^2x = 2 - 4 (1 - cos^2x) = (подставляем значение cosx = 3/4):
= 2 - 4 (1 - (3/4)^2) =
= 2 - 4 (1 - 9/16) =
= 2 - 4*7/16 =
= 2 - 7/4 = 1/4
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Answers & Comments
= 2 - 4 (1 - (3/4)^2) =
= 2 - 4 (1 - 9/16) =
= 2 - 4*7/16 =
= 2 - 7/4 = 1/4