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treyser98
@treyser98
July 2022
2
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решите плиззз. тока 1 вариант.. очень надо.
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Genius00
1)x=90,т.к sin90=12)x=15,т.к cos 60=0,53)x=565,т.к tg45=1
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Bergo
1) sin(2π-x)=1
2π-x=π/2 +2k,k∈Z
-x=π/2 -2π+2πk,kZ
x=3π/2 -2πk,k∈Z
Ответ: x=3π/2 -2πk,k∈Z
2) cos4x=0.5
cos4x=1/2
4x=+-arccos1/2 +2πk,k∈Z
4x=+-π/3 +2πk,k∈Z
x=+-π/12 +πk/2,k∈Z
Ответ: x=+-π/12 +πk/2,k∈Z
3) tg(x-4π)=1
x-4π=π/4 +πk,k∈Z
x=π/4 +4π+πk,k∈Z
x=17π/4 +πk,k∈Z
Ответ: x=17π/4 +πk,k∈Z
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Answers & Comments
2π-x=π/2 +2k,k∈Z
-x=π/2 -2π+2πk,kZ
x=3π/2 -2πk,k∈Z
Ответ: x=3π/2 -2πk,k∈Z
2) cos4x=0.5
cos4x=1/2
4x=+-arccos1/2 +2πk,k∈Z
4x=+-π/3 +2πk,k∈Z
x=+-π/12 +πk/2,k∈Z
Ответ: x=+-π/12 +πk/2,k∈Z
3) tg(x-4π)=1
x-4π=π/4 +πk,k∈Z
x=π/4 +4π+πk,k∈Z
x=17π/4 +πk,k∈Z
Ответ: x=17π/4 +πk,k∈Z