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6. Enkele standaardintegralen

$
\eqalign{
  & \int {\frac{1}
{{\sin x}}dx}  = \ln \frac{{1 - \cos x}}
{{\left| {\sin x} \right|}}\,\,(1.8)  \cr
  & \int {\frac{{dx}}
{{a^2  + b^2 x^2 }} = \frac{1}
{{ab}}\arctan \frac{{bx}}
{a}} \,\,\,(1.19)  \cr
  & \int {\sin mx \cdot \cos nx\,dx =  - \frac{{\cos (m - n)x}}
{{2(m - n)}}}  - \frac{{\cos (m + n)x}}
{{2(m + n)}}\,\,(m^2  \ne n{}^2)\,\,(1.16)  \cr
  & \int {\sqrt {a^2  + x^2 } } dx = \frac{x}
{2}\sqrt {a^2  + x^2 }  + \frac{{a^2 }}
{2}\ln \left( {x + \sqrt {a^2  + x^2 } } \right)\,\,\left( {a \in {R}^ +  } \right)\,\left( {1.25} \right)  \cr
  & \int {\frac{1}
{{a^2  - b^2 x^2 }}} \,dx = \frac{1}
{{2ab}}\ln \left| {\frac{{a + bx}}
{{a - bx}}} \right|\,\,\,\left( {a,b \in {R}^ +  } \right)\,\,\left( {1.20} \right)  \cr
  & \int {\frac{{dx}}
{{\sqrt {a^2  - x^2 } }}}  = \arcsin \left( {\frac{x}
{a}} \right)\,\,\left( {a \in {R}^ +  } \right)\left( {1.21} \right) \cr}
$

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