# Post History

##
**#4: Post edited**

~~Find $y=~~**a**\cos^3\theta$ and, $x=**b**\sin^3\theta$ from hypocycloid's formula

- Find $y=
**b**\cos^3\theta$ and, $x=**a**\sin^3\theta$ from hypocycloid's formula

- Here's the equation for hypocycloid $$(\frac{x}{a})^{\dfrac{2}{3}}+(\frac{y}{b})^{\dfrac{2}{3}}=1$$
- Now, I have to find an equation for x and y. I can simply find by simple algebra. But, my book had used parametric equation, and they wrote
~~$$y=~~**a**\cos^3\theta, x=**b**\sin^3\theta$$- How to find [parametric equation](https://en.wikipedia.org/wiki/Parametric_equation)? I don't have separated equation for x and y so, I can't do [this way](https://youtu.be/97pe-QlSGqA?t=715)

- Here's the equation for hypocycloid $$(\frac{x}{a})^{\dfrac{2}{3}}+(\frac{y}{b})^{\dfrac{2}{3}}=1$$
- Now, I have to find an equation for x and y. I can simply find by simple algebra. But, my book had used parametric equation, and they wrote
- $$y=
**b**\cos^3\theta, x=**a**\sin^3\theta$$ - How to find [parametric equation](https://en.wikipedia.org/wiki/Parametric_equation)? I don't have separated equation for x and y so, I can't do [this way](https://youtu.be/97pe-QlSGqA?t=715)

##
**#3: Post edited**

~~Find $~~**x**=a\cos^3\theta$ and, $**y**=b\sin^3\theta$ from hypocycloid's formula

- Find $
**y**=a\cos^3\theta$ and, $**x**=b\sin^3\theta$ from hypocycloid's formula

- Here's the equation for hypocycloid $$(\frac{x}{a})^{\dfrac{2}{3}}+(\frac{y}{b})^{\dfrac{2}{3}}=1$$
- Now, I have to find an equation for x and y. I can simply find by simple algebra. But, my book had used parametric equation, and they wrote
~~$$~~**x**=a\cos^3\theta,**y**=b\sin^3\theta$$- How to find [parametric equation](https://en.wikipedia.org/wiki/Parametric_equation)? I don't have separated equation for x and y so, I can't do [this way](https://youtu.be/97pe-QlSGqA?t=715)

- Here's the equation for hypocycloid $$(\frac{x}{a})^{\dfrac{2}{3}}+(\frac{y}{b})^{\dfrac{2}{3}}=1$$
- $$
**y**=a\cos^3\theta,**x**=b\sin^3\theta$$

##
**#2: Post edited**

- Here's the equation for hypocycloid $$(\frac{x}{a})^{\dfrac{2}{3}}+(\frac{y}{b})^{\dfrac{2}{3}}=1$$
- $$x=a\cos^3\theta, y=b\sin^3\theta$$
~~How to find [parametric equation](https://en.wikipedia.org/wiki/Parametric_equation)?~~

- Here's the equation for hypocycloid $$(\frac{x}{a})^{\dfrac{2}{3}}+(\frac{y}{b})^{\dfrac{2}{3}}=1$$
- $$x=a\cos^3\theta, y=b\sin^3\theta$$
- How to find [parametric equation](https://en.wikipedia.org/wiki/Parametric_equation)?
**I don't have separated equation for x and y so, I can't do [this way](https://youtu.be/97pe-QlSGqA?t=715)**

##
**#1: Initial revision**

Find $x=a\cos^3\theta$ and, $y=b\sin^3\theta$ from hypocycloid's formula