Mathematical analysis is a branch of mathematics that deals with the study of limits, sequences, series, and calculus. This paper provides an overview of the key concepts and techniques in mathematical analysis, with a focus on solutions to selected problems. We draw on the textbook "Mathematical Analysis" by Vladimir Zorich as a primary reference.

(Zorich, Chapter 7, Problem 10)

We have $f(g(x)) = f(\frac11+x) = \frac1\frac11+x = 1+x$.

(Zorich, Chapter 2, Problem 10)

As $x$ approaches 0, $f(g(x))$ approaches 1.

Find the derivative of the function $f(x) = x^2 \sin x$.

Mathematical analysis is a fundamental area of mathematics that has numerous applications in science, engineering, and economics. The subject has a rich history, dating back to the work of ancient Greek mathematicians such as Archimedes and Euclid. Over the centuries, mathematical analysis has evolved into a rigorous and systematic field, with a well-developed theoretical framework.