Решить уравнения и неравенства:
а) log₃(x+2)+log₃(x+1)=log₃(x+5)        б) 2Sin²x-Cosx-1=0
в)[tex] 2^{x} - 2^{x-2} \leq 3[/tex]
Нужно подробное решение.
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