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EwaGrig
@EwaGrig
July 2022
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Упростить выражение:
[tex]а) \frac{ 1 - cos2 \alpha }{sin( \pi +2 \alpha )} * tg( \frac{ \pi }{2} + \alpha )[/tex]
б) [tex]ctg( \pi П+a) \frac{cos(\frac{3 \pi }{2} - 2 \alpha )}{1+cos2a}[/tex]
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girlsanime
1-(кос2 а-син2 а)/-син2 а*(-ктг а)=1-кос2 а+син2 а/-син2 а*(-ктг а)=0
ктг а *(-син2 а)/2кос^2 а=кос а/син а * (-2син а кос а)/2кос^2=-1
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ктг а *(-син2 а)/2кос^2 а=кос а/син а * (-2син а кос а)/2кос^2=-1