General simplification
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$$t^{2} - t x + x^{2}$$
The perfect square
Let's highlight the perfect square of the square three-member
$$t^{2} + \left(- t x + x^{2}\right)$$
Let us write down the identical expression
$$t^{2} + \left(- t x + x^{2}\right) = \frac{3 x^{2}}{4} + \left(t^{2} - t x + \frac{x^{2}}{4}\right)$$
or
$$t^{2} + \left(- t x + x^{2}\right) = \frac{3 x^{2}}{4} + \left(t - \frac{x}{2}\right)^{2}$$
/ / ___\\ / / ___\\
| x*\1 - I*\/ 3 /| | x*\1 + I*\/ 3 /|
|t - ---------------|*|t - ---------------|
\ 2 / \ 2 /
$$\left(t - \frac{x \left(1 - \sqrt{3} i\right)}{2}\right) \left(t - \frac{x \left(1 + \sqrt{3} i\right)}{2}\right)$$
(t - x*(1 - i*sqrt(3))/2)*(t - x*(1 + i*sqrt(3))/2)
Assemble expression
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$$t^{2} - t x + x^{2}$$
Combining rational expressions
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$$t^{2} + x \left(- t + x\right)$$
Rational denominator
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$$t^{2} - t x + x^{2}$$