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ЛеркаLerka
@ЛеркаLerka
July 2022
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ПОМОГИТЕ, ПОЖАЛУЙСТА!!!
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студент1994
1)
(1 -
a) -
a =
*
-
= (
/
)*
-
= (
-(
= 0
2) ( 2
*cosa/
* sina=(2sina*
)/tg2a = sin2a*cos2a*cosa / sin2a = cos2a * cosa
3) 2cosa*sina/tg2a = sin2a/tg2a = sin2a * cos2a/sin2a = cos2a
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студент1994
4) = 1/sin2a -ctg2a - cos2a = 1/sin2a - cos2a / sin2a - cos2a = (1-cos2a)/ sin2a - cos2a = 1-cos2a = sin2a ( синус квадрат альфа - здесь везде 2ф - это квадрат альфа)
студент1994
5) = -сos2a+cos2b + cos2a = cos2b
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Answers & Comments
2) ( 2*cosa/ * sina=(2sina* )/tg2a = sin2a*cos2a*cosa / sin2a = cos2a * cosa
3) 2cosa*sina/tg2a = sin2a/tg2a = sin2a * cos2a/sin2a = cos2a