$3.(20$ pts$)$ Determine $($a$)$ the location of the stagnation point and $($b$)$ the value of the stagnation streamline for the following potential flow field. A combination of a uniform flow field with a velocity of $\backslash (1\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash ),$ a source flow field with a strength of $\backslash (2\backslash$mathrm$\{$~m$\}^\{2\}/\backslash$mathrm$\{$s$\}\backslash ),$ and a second source flow field with a strength of $\backslash (4\backslash$mathrm$\{$~m$\}^\{2\}/\backslash$mathrm$\{$s$\}\backslash ).$ The two sources lie on top of one another at the origin.