Floating point errors may apply when dealing with the ^ (to the power of). Parenthesis inside parenthesis NOW WORKS! Press enter or < to do Backspace. Sticky keys errors-- not sure how! Enter button lets you enter your own equation in text. Completely mobile friendly. You may see letters popping up instead of scientific symbols. s=sin c=cos q=sqrt e=e^ t=10^ l=log n=ln h=tan p=asin o=acos i=atan