Решите пожалуйста все
1)Найти область определения функции:
[tex]y= \frac{1-8x}{ \sqrt{ x^{2} -5x+6} } [/tex]
2)Решите уравнения:
А)[tex]2*3 ^{x+1}-4*3 ^{x-1}=42
[/tex]
б)[tex]2sin ^{2} x-5cosx+1=0
[/tex]
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