3tgx\tgx+ctgx*(1+ctg^2 x) выражение равно??
3sinx/(cosx(1/sinxcosx))(1/sin^2x)=3sinx*sinx*(1/sin^2x)=3
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3sinx/(cosx(1/sinxcosx))(1/sin^2x)=3sinx*sinx*(1/sin^2x)=3