I read that $\cos (2 \theta)$ is two-fold symmetric about cartesian coordinate system ? Is that true , if so how ?
2026-03-27 15:06:30.1774623990
Is $\cos (2\theta) $ two-fold symmetric?
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It's $\frac{x^2-y^2}{x^2+y^2}$, which is unchanged under $x\mapsto -x$ or $y\mapsto -y$.