Koliko postoji realnih brojeva
za koje vrijedi
How many real numbers
that satisfy
are there?
[lang=hr]
Koliko postoji realnih brojeva $x \in \left[ 1 , 2021 \right]$ za koje vrijedi
\[ \left( 1 - \frac{1}{8} \cos^2x \right) ^ 8 = \sin^2x ?\]
[/lang]
[lang=en]
How many real numbers $x \in \left[ 1 , 2021 \right]$ that satisfy
\[ \left( 1 - \frac{1}{8} \cos^2x \right) ^ 8 = \sin^2x \]
are there?
[/lang]