$x,y$ are real numbers such that $$x^2+y^2=1    ,  20x^3-15x=3$$Find the value of $|20y^3-15y|$.(K. Tyshchuk)
1. Given the equations:
   \[
   x^2 + y^2 = 1
   \]
   and
   \[
   20x^3 - 15x = 3
   \]
   we need to find the value of \( |20y^3 - 15y| \).

2. We can use the trigonometric identities by setting \( x = \cos \alpha \) and \( y = \sin \alpha \). This substitution is valid because \( x^2 + y^2 = 1 \) is the equation of a unit circle, and any point on the unit circle can be represented as \( (\cos \alpha, \sin \alpha) \).

3. Substituting \( x = \cos \alpha \) into the second equation:
   \[
   20 (\cos \alpha)^3 - 15 \cos \alpha = 3
   \]
   Using the triple angle formula for cosine, \( \cos 3\alpha = 4 \cos^3 \alpha - 3 \cos \alpha \), we can rewrite the equation as:
   \[
   20 \cos^3 \alpha - 15 \cos \alpha = 3
   \]
   Dividing the entire equation by 5:
   \[
   4 \cos^3 \alpha - 3 \cos \alpha = \frac{3}{5}
   \]
   Therefore:
   \[
   \cos 3\alpha = \frac{3}{5}
   \]

4. Next, we need to find \( \sin 3\alpha \). Using the Pythagorean identity for sine and cosine:
   \[
   \sin^2 3\alpha + \cos^2 3\alpha = 1
   \]
   Substituting \( \cos 3\alpha = \frac{3}{5} \):
   \[
   \sin^2 3\alpha + \left( \frac{3}{5} \right)^2 = 1
   \]
   \[
   \sin^2 3\alpha + \frac{9}{25} = 1
   \]
   \[
   \sin^2 3\alpha = 1 - \frac{9}{25}
   \]
   \[
   \sin^2 3\alpha = \frac{25}{25} - \frac{9}{25}
   \]
   \[
   \sin^2 3\alpha = \frac{16}{25}
   \]
   \[
   \sin 3\alpha = \pm \frac{4}{5}
   \]

5. Now, we need to find \( |20y^3 - 15y| \). Recall that \( y = \sin \alpha \). Using the triple angle formula for sine, \( \sin 3\alpha = 3 \sin \alpha - 4 \sin^3 \alpha \), we can write:
   \[
   \sin 3\alpha = 3y - 4y^3
   \]
   Given that \( \sin 3\alpha = \pm \frac{4}{5} \), we have:
   \[
   3y - 4y^3 = \pm \frac{4}{5}
   \]

6. To find \( |20y^3 - 15y| \), we multiply the equation \( 3y - 4y^3 = \pm \frac{4}{5} \) by 5:
   \[
   15y - 20y^3 = \pm 4
   \]
   Taking the absolute value:
   \[
   |20y^3 - 15y| = 4
   \]

The final answer is \( \boxed{4} \).