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Jaser
@Jaser
September 2021
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Даю много баллов!Помогите решить
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FreeVVind
... = 8 × кор.2 × соs2x = 8 × кор.2 × соs п/4 = (8 × кор.2 × кор.2) ÷ 2 = 8.
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FreeVVind
Вначале использовал формулу косинус двойного угла.
prostotom
8√2(cos²x-sin²x)=8√2*cos2x.
При x=π/8: 8√2*cos(2*π/8)=8√2*cos(π/4)=8√2*(1/√2)=8√2/√2=8.
Ответ: 8.
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Answers & Comments
При x=π/8: 8√2*cos(2*π/8)=8√2*cos(π/4)=8√2*(1/√2)=8√2/√2=8.
Ответ: 8.