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CathyRey
@CathyRey
July 2022
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Тригонометрия
. Один пример решите, пожалуйста.
Подробное решение!
3)
2cos²x + 5sinx - 4 = 0
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shadow10
2cos²x + 5sinx - 4 = 0
2-2sin²x+5sinx-4=0
-2sin²x+5sinx-2=0
D=25-16=9
x12=(-5+-3)/-4=2 1/2
sinx=2 не подходит !sinx!<=1
sinx=1/2
x=(-1)^n*pi/6+3piN
2 votes
Thanks 2
mmb1
Verified answer
Вот держи решение :)
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Answers & Comments
2-2sin²x+5sinx-4=0
-2sin²x+5sinx-2=0
D=25-16=9
x12=(-5+-3)/-4=2 1/2
sinx=2 не подходит !sinx!<=1
sinx=1/2
x=(-1)^n*pi/6+3piN
Verified answer
Вот держи решение :)