OneLineDraw app for iPhone and iPad

Draw variety of figures by writing one line mathematical formula.
With over 20 examples, you can enjoy this app even if you have no
mathematical knowledge. Formulas you have written can be saved on your
iPad, and can be saved as text files by iTunes file sharing.

(Mathematical Description)
The screen is a complex plane of the range [-1,1] of real and
imaginary part.
You can write your expression using following elements.
+, -, *, /: Add, Subtract, Multiply, Divide
t: Parameter, sweeping in the range [0,1].
e, pi: Constants.
Functions:
real, imag, abs, arg, conj, sqrt, exp, pow, log, log10,
sin, cos, tan, sinh, cosh, tanh