حل {l}{x=frac{x_{1}x_{2}+y_{1}y_{2}}{x_2^2+y_2^2}}{y={(x_2^2+y_2^2)}}{z=y}{text{Solvefor}atext{where}}{a=z}

$$\left. \begin{array} { l } { x = \frac{x_{1} x_{2} + y_{1} y_{2}}{x_{2} ^ {2} + y_{2} ^ {2}} }\\ { y = {(x_{2} ^ {2} + y_{2} ^ {2})} }\\ { z = y }\\ { \text{Solve for } a \text{ where} } \\ { a = z } \end{array} \right.$$

حل مسائل x، y، z

$$x=\frac{x_{1}x_{2}+y_{1}y_{2}}{x_{2}^{2}+y_{2}^{2}}$$

$$y=x_{2}^{2}+y_{2}^{2}$$

$$z=x_{2}^{2}+y_{2}^{2}$$

$$\left(y_{2}\neq 0\text{ or }x_{2}\neq 0\right)\text{ and }\left(a>y_{2}^{2}\text{ or }y_{2}\neq 0\right)\text{ and }a\geq y_{2}^{2}\text{ and }|x_{2}|=\sqrt{a-y_{2}^{2}}$$