Question:
From the following functions, select all that have the second derivative positive on the interval $(0; 1)$.
Project ID:
7400120138
Answer 1:
$f(x)=2x^2$
Answer 1 Correct:
1
Answer 2:
$f(x)=3x^3$
Answer 2 Correct:
1
Answer 3:
$f(x)=\frac{1}{x+1}$
Answer 3 Correct:
1
Answer 4:
$f(x)=\frac{1}{x^2}$
Answer 4 Correct:
1
Answer 5:
$f(x)=\mathrm{e}^x$
Answer 5 Correct:
1
Answer 6:
$f(x)=-\ln\,x$
Answer 6 Correct:
1
Answer 7:
$f(x)=\mathrm{tg}\,x$
Answer 7 Correct:
1
Answer 8:
$f(x)=\mathrm{cotg}\,x$
Answer 8 Correct:
1