Write equation of tangent line at point on the circle

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x^2 x^ \log_ \sqrt \nthroot[\msquare] \le \ge \frac <\msquare> \cdot \div x^ \pi
\left(\square\right)^ \frac \frac <\partial> \int \int_<\msquare>^ \lim \sum \infty \theta (f\:\circ\:g) f(x)

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