Scientific Calculator

A scientific calculator is designed and published for engineering.
40 buttons are classed to six categories including functional, power, digital, control, operations, and compute buttons, respectively.
(1) Functional buttons: sin, cos, tan, asin, acos, atan, sinh, cosh, tanh, and abs.
(2) Power buttons: ln, exp, log, 10^, ^(1/2), ^2, ^(1/3), ^3, and ^y.
(3) Digital buttons: 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, ., pi, and e.
(4) Control buttons: (, ), and clear.
(5) Operational buttons: +, -, *, and /.
(6) Compute button: =.
It is noted that every single button is not always available for action. An available button is without transparency background and the button color is looked gray. Comparatively, an unavailable button is with transparency background and button color is looked like black.