Question

Calculus 2


See below

Answer 1

\[\begin{align}
& if\int{\tan (x)dx=-\log (\cos (x))+C} \\
& thenalso\int{\tan (x)dx=-\ln (\cos (x))+C} \\
\end{align}\]


True or false ?

Answer 2

the log in the answer has base =e

Answer 3

oh

Answer 4

how did you know

Answer 5

?

Answer 6

Like wolfram doesn't show anything about it http://www.wolframalpha.com/input/?i=int+of+tan%28x%29

Answer 7

integral f'(x) / f(x) dx = log f(x) +c

here, it is assumed that log has base e

Answer 8

oh ok thanks

Answer 9

wolf says that log has natural base