Java Script calculator Help

Commands:

exp - e^x
ln - natural logarithm
sqrt -square root
x² - square of x
/ - division
* - multiplication
- - subtraction
+ adition
. fraction mark
+- -it changes the sign of the number
1/x -inverse of a number
cos - cosine of a number (radians)
sin - sine of a number (radians)
tan - tangent of a number
( ) - parentesis. Ex:2+(4-7)
pi - 3.14159265...
acos - arc cosine of a number (radians)
asin - arc sine of a number (radians)
atan - arc tangent of a number (radians)
x³ - X at the third power
Rnd - random number
cosh - hyperbolic cosine of a number (radians)
sinh - hyperbolic sine of a number (radians)
tanh - hyperbolic tangent of a number (radians)
cbrt - cubic root
log -decimal logarithm of a number
10^x - antilogarithm of a number
D->R - degree to radians
R->D - radians to degree
X^Y - X in the Y power
A - area of a circle, given radius
V - volume of a sphere, given radius
C/CE - clear/clean error
<- - (back space) when pressed delete last digit
Enter - press to solve

Problems:
1-If when you reload dont appear keybord
click on your browser location and press ENTER
in your computer keyboard.

2-Functions asin and acos work for limited numbers
i.e: -1 < X < +1

for asin.

3-Functions sin,cos and tan work in radians only.

4-Cubic Root (cbrt) returns negative and positive results.

5-Many numbers can appear with garbage in the last digits
Example:
sin(pi)= 0.00000000000000012246063538223773
instead of 0 (zero).
1.4*1.4=1.9599999999999997 instead of 1.96.

Copyright:
Author name is mentioned at the body of the HTML code.