Помогите решить уравнение9х+6х-15=815
1 ответ:
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ОДЗ
4-x²≥0⇒x∈[-2;2]
1-1/cos²2x=0
1-1-tg²2x=0
tg2x=0
2x=πn,n∈z
x=πn/2,n∈z
x1=-π/2∈[-2;2]
x2==0∈[-2;2]x3=π/2∈[-2;2]
x1=-2
x5=2
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5
ОДЗ
4-x²≥0⇒x∈[-2;2]
1-1/cos²2x=0
1-1-tg²2x=0
tg2x=0
2x=πn,n∈z
x=πn/2,n∈z
x1=-π/2∈[-2;2]
x2==0∈[-2;2]x3=π/2∈[-2;2]
x1=-2
x5=2