Problems
Function - 3
Function - 3
Implement a function $f(x, y) = x^2 + sin(x \cdot y) - y^2$.
\InputFile
Each line contains two real numbers $x$ and $y$.
\OutputFile
For each test case print in a separate line the value of the function $f(x, y)$ with four digits after the decimal point.
Input example #1
2.234 2.12 10 23 56.1 0.012 23.26 5.1
Output example #1
-0.5034 -429.6161 3147.8333 514.3327