As per the question,
Solve: $\int \frac{1}{x^{2}+6 x+13} d x$
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Exercise 19.15
Solve: $\int \frac{1}{2 x^{2}-x-1} d x$
As per the question suggests,
Solve: $\int \frac{1}{1+x-x^{2}} d x$
As per the question suggests, By using,
Solve: $\int \frac{1}{4 x^{2}+12 x+5} d x$
As per the question suggests,