Помогите дописать интеграл, пример: [tex]\int\limits {ctg^6x} \, dx[/tex] =[tex]\left \{ {{t=ctgx =\ \textgreater \ xarcctgt} \atop {dx=-\frac{dt}{1+t^2} }} \right.[/tex] .... Ответ: [tex]-\frac{1}{5} ctg^5x+\frac{1}{3} ctg^3x-ctgx+arctg(ctgx)+C[/tex]
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