Formula:7381

Digital Library of Mathematical Functions ID 19.30.E10

${\displaystyle{\displaystyle r^{2}=2a^{2}\cos\left(2\theta\right),}}$

Constraint(s)

${\displaystyle{\displaystyle 0\leq\theta\leq 2\pi}}$

Symbols List

• ${\displaystyle{\displaystyle\pi}}$: the ratio of the circumference of a circle to its diameter
• ${\displaystyle{\displaystyle\cos\NVar{z}}}$: cosine function
• ${\displaystyle{\displaystyle r}}$: length
 

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