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RiosLorenzoAlexandra
@RiosLorenzoAlexandra
July 2022
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Помогите, пожалуйста, 60 баллов!!!
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армения20171
3sin²x-7sinxcosx+14cos²x-2(sin²x+cos²x)=0
sin²x-7sinxcosx+12cos²x=0
:cos²x≠0
tg²x-7tgx+12=0
tgx=t
t²-7t+12=0
D=49-48=1
t=(7±1)/2
t1=4
t2=3
tgx=4;x=arctg4+πk
tgx=3;x=arctg3+πk;k€Z
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Answers & Comments
sin²x-7sinxcosx+12cos²x=0
:cos²x≠0
tg²x-7tgx+12=0
tgx=t
t²-7t+12=0
D=49-48=1
t=(7±1)/2
t1=4
t2=3
tgx=4;x=arctg4+πk
tgx=3;x=arctg3+πk;k€Z