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jako91
@jako91
July 2022
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3sin^2x+4cos^2x-13sinx*cosx=0 помогите пожалуйста срочно
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kraska69
3sin²x+4cos²x-13sinxcox=0|:cos²
3tg²x+4-13tgx
tgx=a
3a²-13a+4=0
D=169-48=121=11²
a1=13+11/6=4
a2=13-11/6=1/3
tgx=4
x=arctg4+Пn
tgx=1/3
x=arctg1/3+Пn
3 votes
Thanks 5
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Answers & Comments
3tg²x+4-13tgx
tgx=a
3a²-13a+4=0
D=169-48=121=11²
a1=13+11/6=4
a2=13-11/6=1/3
tgx=4
x=arctg4+Пn
tgx=1/3
x=arctg1/3+Пn