Let f be defined for (x, y) = R² if x #0 where f(x, y) = (x² + y²) x ,sin x + cos y Prove whether or not there is a neighborhood U of (T/2, 7/2) such that flu: Uf(U) is a bijection.

Branch of mathematical analysis that studies real numbers, sequences, and series of real numbers and real functions. The concepts of real analysis underpin calculus and its application to it. It also includes limits, convergence, continuity, and measure theory.