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polinkabum
@polinkabum
July 2022
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Помогите решить уравнение 5-7sinx=3cos^2x
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hello93
Привет, решение на фотографии
1 votes
Thanks 0
Асик777Асик
5-7sinx=3cos²x
5-7sinx=3(1-sin²x)
5-7sinx=3-3sin²x
5-7sinx-3+3sin²x=0
3sin²x-7sinx+2=0
sinx=a
3a²-7a+2=0
D=7²-4*3*2=49-24=25
, k∈z.
∅.
1 votes
Thanks 3
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Answers & Comments
5-7sinx=3(1-sin²x)
5-7sinx=3-3sin²x
5-7sinx-3+3sin²x=0
3sin²x-7sinx+2=0
sinx=a
3a²-7a+2=0
D=7²-4*3*2=49-24=25
, k∈z.
∅.