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Pan666
@Pan666
August 2022
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cos 2 альфа - sin^2 альфа / 2sin^2 альфа -cos^2 альфа
сократить по формулам
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ВладимирБ
Verified answer
(cos(2a)-(sin(a))^2)/(2(sin(a))^2-(cos(a))^2)=
=((cos(a)^2-(sin(a))^2-(sin(a))^2)/(2(sin(a))^2-(cos(a))^2)=
-((2(sin(a))^2-(cos(a))^2)/(2(sin(a))^2-(cos(a))^2)=-1
формула cos(2a)=(cos(a))^2-(sin(a))^2
1 votes
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Pan666
это точно так ?
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(cos(2a)-(sin(a))^2)/(2(sin(a))^2-(cos(a))^2)==((cos(a)^2-(sin(a))^2-(sin(a))^2)/(2(sin(a))^2-(cos(a))^2)=
-((2(sin(a))^2-(cos(a))^2)/(2(sin(a))^2-(cos(a))^2)=-1
формула cos(2a)=(cos(a))^2-(sin(a))^2