As per the question suggests,
Solve: $\int \frac{1}{\sqrt{1+4 x^{2}}} d x$
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Exercise 19.14
Solve: $\int \frac{x^{2}-1}{x^{2}+4} d x$
as per the question suggestion,
Solve: $\int \frac{1}{a^{2} x^{2}+b^{2}} d x$
as per the question suggests,
Solve: $\int \frac{1}{a^{2} x^{2}-b^{2}} d x$
as per the question suggests,
Solve: $\int \frac{1}{a^{2}-b^{2} x^{2}} d x$
As per the question suggests,