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Savada
@Savada
August 2022
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Найдите 5cos2α , если sinα = − 0,4 .
С подробным решением пожалуйста.
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Korgath
Verified answer
5 cos 2α = 5 (1 - 2 sin²α) = 5 - 10 sin²α = 5 - 10 * (-0,4)²=5- 10* 0,16 = 5-1,6 = 3,4
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Answers & Comments
Verified answer
5 cos 2α = 5 (1 - 2 sin²α) = 5 - 10 sin²α = 5 - 10 * (-0,4)²=5- 10* 0,16 = 5-1,6 = 3,4