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ZW=<-15,∞)
f rosnaca dla x∈<0,∞)
f malejaca x∈(-∞,0>
f(x)>0 dla x∈(-∞,-3) u (5,∞)
f(x)≤0 dla x∈<-3,5>
f max brak
fmin y=-15
os symetrii x=0