evaluate \(\lfloor -4 -.5 \rfloor \cdot \lceil 4 +.5 \rceil \cdot \lfloor -3 -.5 \rfloor \cdot \lceil 3 +.5 \rceil \cdot \dots \cdot \lfloor -.5 \rfloor \cdot \lceil .5 \rceil\)
This reduces to
(-5)*5*(-4)*4*(-3)*3*(-2)*2*(-1)*1
or - 52*42*32*22 = -14400
