( $x^{2}$ ) + x = 30,x
$(\frac{z-z^{-1}}{2i})^4 $ simplified
1,181,862,612,198,359,040 x 2 =
-15=x+(x*x)
$(\frac{z-z^{-1}}{2})^4 $ simplified
cos(x) = 1,x
$(\frac{z+z^{-1}}{2})^4 $ simplified
sin((x+y)/2) = cos(x/2)
whai is the smallest number that 8 and 12 can divide without remainder
x.x-2x = -1
x = ?
