The crash was caused by a buffer overflow, which resulted from the very long sentence that was created.  Fixed for the next release.

If all you need for your class is to display the sequence of derivatives of sin and cos, you could put them into a table, with a derivative given for -@(2&o.) for example.

Henry Rich

On 1/24/2020 9:23 AM, Arnab Chakraborty wrote:
Dear all,

sin deriv 1

works fine. So do

sin deriv 9

though the output is horrendously complex.

sin deriv 40

gives domain error.  Last, but not the least,

sin deriv 10

crashes after some delay.

JVERSION
Engine: j901/j32/android
Release-c: commercial/2020-01-12T21:36:27
Library: 9.01.19
J Android: 1.4.03/7.0/24
Platform: Android 32 (armeabi-v7a)
Installer: unknown
InstallPath: /storage/emulated/0/Android/data/com.jsoftware.j.android/files
Contact: www.jsoftware.com
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