** Problem :**compute the rectangular form **a+ib** of .

>> rectform(ln(3+4*I)); ln(5) + I atan(4/3)

The real and imaginary part are obtained with `Re(..)`

and `Im(..)`

respectively.

[New] ** Problem :**compute the rectangular form of .

>> rectform(tan(x+I*y),{x,y}); sin(2 x) I sinh(2 y) -------------------- + -------------------- cos(2 x) + cosh(2 y) cos(2 x) + cosh(2 y)

Here the set `{x,y}`

given as second argument specifies that the
variables **x** and **y** are real. By default all variables are considered
as complex.

** Problem :**do not simplify to **0** without any assumption on
the imaginary part of **z**.

>> sqrt(exp(z))-exp(z/2); / z \ 1/2 - exp | - | + exp(z) \ 2 /

Sun Apr 23 10:32:10 MDT 1995