Last week I bought a WP-34S calculator from Eric Rechlin and I am generally very pleased with the advanced technology incorporated into this device. I did, however, discover one small bug that I wish to report. The "Complex Hyperbolic Tangent" function does not follow the rules described in the manual of using RADIANS exclusively.

When the calculator is in the DEGREES or GRADS mode, the Complex Hyperbolic Tangent function (and none of the other complex trig functions) erroneously performs a conversion of the imaginary component into RADIANS (from DEGREES or GRADS depending on the mode)

before performing the calculation. If the calculator is actually in the RADIANS mode then the Complex Hyperbolic Tangent function performs as expected. Example: With 3 in the X register and 4 in the Y register (representing the complex number 3 + i4 ) with the calculator in DEGREES mode the Complex Hyperbolic Tangent function returns a result of 0.99510252637 (real) 0.00068657645 (imag).

The correct answer is: 1.00070953607 (real) 0.00490825807 (imag)

My actual calculator has a VERS string "34S3.2T3382" and I also

confirmed that the emulator with Version 3.2 SVN 3402 exhibits

the same behavior, so I believe the bug has not been fixed yet.