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Shamsik05
@Shamsik05
June 2022
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15 БАЛЛОВ ПОМОГИТЕ УМОЛЯЯЮ
(2sin2a-cos2a)^2+(2cos2a+sin2a)^2
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Answers & Comments
mikael2
4(2sin2a-cos2a)^2+(2cos2a+sin2a)^2=4sin
²2a-4sin2acos2a+cos²2a+
+4cos²2a+4sin2acos2a+sin²2a=4+1=5
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Shamsik05
А откуда 4 и 1?????
mikael2
из того что сумма квадратов синуса и косинуса =1
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Answers & Comments
+4cos²2a+4sin2acos2a+sin²2a=4+1=5