Fix LaTeX formatting for arbitrary-angle MS gate (#6166)

Author: jli0108

cirq-ionq/cirq_ionq/ionq_native_gates.py

@@ -179,14 +179,14 @@ def __pow__(self, power):
 class MSGate(cirq.Gate):
     r"""The Mølmer–Sørensen (MS) gate is a two qubit gate native to trapped ions.
 
-    The unitary matrix of this gate for parameters $\phi_0$, $\phi_1$ and $\theta is
+    The unitary matrix of this gate for parameters $\phi_0$, $\phi_1$ and $\theta$ is
 
     $$
     \begin{bmatrix}
-        cos{\theta/2} & 0 & 0 & -i*e^{-i*2*\pi(\phi_0+\phi_1)}*sin{\theta/2} \\
-        0 & cos{\theta/2} & -i*e^{-i*2*\pi(\phi_0-\phi_1)}*sin{\theta/2} & 0 \\
-        0 & -i*e^{i*2*\pi(\phi_0-\phi_1)}*sin(\theta/2) & cos{\theta/2} & 0 \\
-        -i*e^{i*2*\pi(\phi_0+\phi_1)}*sin{\theta/2} & 0 & 0 & cos{\theta/2}
+        \cos\frac{\theta}{2} & 0 & 0 & -ie^{-i2\pi(\phi_0+\phi_1)}\sin\frac{\theta}{2} \\
+        0 & \cos\frac{\theta}{2} & -ie^{-i2\pi(\phi_0-\phi_1)}\sin\frac{\theta}{2} & 0 \\
+        0 & -ie^{i2\pi(\phi_0-\phi_1)}\sin\frac{\theta}{2} & \cos\frac{\theta}{2} & 0 \\
+        -ie^{i2\pi(\phi_0+\phi_1)}\sin\frac{\theta}{2} & 0 & 0 & \cos\frac{\theta}{2}
     \end{bmatrix}
     $$