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ksushov
@ksushov
August 2022
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Найдите значение выражения : 2sin^2 2x-9cos^2 2x, если cos2x=-0,9
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xFROZx
2-2cos^2 2x -9cos^2 2x=
2-11cos^2 2x=
2-11*0,81= 2- 8,91= -6,91
10 votes
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Answers & Comments
2-11cos^2 2x=
2-11*0,81= 2- 8,91= -6,91