1) 2^xy=5.
xy = log((2),5).
y = log((2),5)/x.
2) lgx+lg(y+1)=4.
lg(x*(y+1))=4.
10^4 = xy+x.
y = (10^4 - x)/x = (10^4/x) - 1 .
3) (1+x)cosy-x^2=0.
cosy = x^2/(1+x).
y = arccos(x^2/(1+x)).
1) 2^xy=5.
xy = log((2),5).
y = log((2),5)/x.
2) lgx+lg(y+1)=4.
lg(x*(y+1))=4.
10^4 = xy+x.
y = (10^4 - x)/x = (10^4/x) - 1 .
3) (1+x)cosy-x^2=0.
cosy = x^2/(1+x).
y = arccos(x^2/(1+x)).