
f(x)=
.
Show its limit, when x >0. 

Show the limit of
2lnx+,when
x >0. 

Get line segment OQ in x axis and makes it equal to the length
of chord OP of curve y=x ^2which passes through O. Make
line PQ. It intersects y axis in R. When P move to O, where will
R go?. 

f(x)=
.
Find the slope of
graph of f(x) at point 1. 

Show the derivative of
y=3x. 