Using Math Calci you can evaluate expressions of the form-
f(x)     : where x is an expression in double/integer
literals using the operators +, -, *, /, ^ or any math 
functions and f is any of the following functions-

log(x)          : common log of x
log(x,y)        : log x to the base y
exp(x)          : e raised to the power x
exp(x,y)        : x raised to the power y, same as x^y
sqrt(x)         : square root of x
sin(x)          : sine of x
cos(x)          : cosine of x
tan(x)          : tangent of x
asin(x)         : arc-sine of x
acos(x)         : arc-cosine of x
atan(x)         : arc-tangent of x
sinh(x)         : hyperbolic sine of x
cosh(x)         : hyperbolic cosine of x
tanh(x)         : hyperbolic tangent of x
pi              : the constant pi (=3.14159)
e               : the constant e (=2.71828)
tm              : toggle mode RAD<->DEG (default RAD)
sb/so/sd/sh     : switch to BIN/OCT/DEC/HEX (default=>DEC)
eb/eo/ed/eh     : echo in BIN/OCT/DEC/HEX (default=>DEC)
spd/spe/sp 	: set precision DEFAULT/EXPONENT/
cur             : echo current mode, base, echo and precision
cls             : clear screen
help            : show this help
exit/quit       : exit

Salient Features-
* All names are case insensitive.
* You can make input to be in one system (say decimal) 
and output in some other(say hex or binary)
* You can use exponential or default precision. You can 
manually set the precision (sp0 to sp16) to as many as 16 
decimal places.
* The angles can be read/echoed in radians or degrees.