CPM Homework Help : CALC Problem 7-85

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7-85.

Integrate.

$\int - \frac { 2 } { x } d x$
Hint (a):
Before you integrate, factor the coefficient $−2$ out of the integral.

$\int ( \frac { 2 } { \sqrt { 1 - x ^ { 2 } } } + 4 x ) d x$
Hint (b):
Before you integrate, factor the coefficient $2$ out of the integral.
Hint 2(b):
Do you recognize a familiar trig (or inverse trig) derivative in the integrand?

$\int _ { 0 } ^ { \pi } \pi ^ { x } d x$
Hint (c):
$a^0=1$

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