The equation for a single qubit state vector. It reads as: ket ψ = cosine of θ over 2 ket 0 + e to the i φ sine of θ over 2 ket 0.
#KaTeX is good.
$$
|\psi\rangle = \cos\left(\frac{\theta}{2}\right)|0\rangle + e^{i\phi}\sin\left(\frac{\theta}{2}\right)|1\rangle
$$
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