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Bug 708 : Book p. 118
Last modified: 2008-08-28 20:58
P
roject:
processing
trash
Version:
unspecified
Co
m
ponent:
android
book
core
libraries
pde
reference
tools
web
Status:
RESOLVED
Resolution:
FIXED -
Pr
i
ority:
P2
Severity:
normal
Platform
All
O
S:
All
Windows
Mac OS
Linux
Other
Reporter:
ingenius
Assigned To:
REAS
Attachment
Type
Created
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Description
: Opened: 2007-12-29 09:01
Hello,
angles in math are positive counterclockwise and negative clockwise. The
sine of an angle of PI/2 is +1, of 3*PI/2 is -1. In the book (see picture)
the sine of PI/2 is -1 (wrong!) and of 3*PI/2 is +1 (wrong!). These
mistakes are made in all trigonometrical views dealing with sine and
cosine. Please check all trigonometric functions in the book.
The calulations of sine and cosine in processing are correct, the mistakes
are only in the book.
Peter
Additional Comment
#1 From REAS 2008-03-28 19:34
Thank you for catching it. This is scheduled to be corrected in the 3rd
printing. I'll mark as resolved when I see the correction in print.
Additional Comment
#2 From REAS 2008-08-28 20:58
Confirmed fixed in the third printing.