Backspace glitch fixed! ! is factorial sin,cos,tan are trigonometric functions csc is cosecant: 1/sin sec is secant: 1/cos cot is cotan: 1/tan asin,acos,atan are inverse of sin, cos, tan(give ratio,output angle) All measures in degrees! sqrt is square root ^ is exponent mod is modulo log is base 10 ln is log base e (euler's constant) MC is memory clear MR reads memory into display M+ loads positive value of display into memory M- loads negative value of display into memory Enjoy!