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20010121234554321q
@20010121234554321q
August 2022
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помогите решить...............кркр
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SabinaZh
31. 2sin^2x+7sinxcosx-9cos^2x=0 | ÷sin^2x
2+7ctgx-9ctg^2x=0
ctgx=t
2+7t-9t^2=0
D=7-4×(-9)×2=7+72=79
x1=-7-корень из 79/4
x2=-7+корень из 79/4
32.2sin^2x+5sinx-3=0
sinx=t
2t^2+5t-3=0
D=5-4×2×(-3)=5+24=29
x1=-5-корень из 29/4
х2=-5+корень из 29/4
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Answers & Comments
2+7ctgx-9ctg^2x=0
ctgx=t
2+7t-9t^2=0
D=7-4×(-9)×2=7+72=79
x1=-7-корень из 79/4
x2=-7+корень из 79/4
32.2sin^2x+5sinx-3=0
sinx=t
2t^2+5t-3=0
D=5-4×2×(-3)=5+24=29
x1=-5-корень из 29/4
х2=-5+корень из 29/4