### Confirmed here. ### Cause
Default angle measure is degrees but user does not know. ### Explanation of value obtained Mathematically, cos(pi degrees)=cos(pi * pi / 180 radians)=0.99849715 sin (pi degrees)=sin (pi * pi / 180 radians)=0.054803665. but it is not what the user expects. ### Comparison with other calculators You can have the same thing on regular calculator like the HP-48 (just tested). But on that machine, the screen displays the current angle unit at all times ! Hence, changing bug title. ### How to solve ? Suggesting to display angle units at all times in advanced mode. ** Summary changed: - Getting invalid results for sin (pi) and cos (pi ) in advanced mode + gcalctool default angle unit not shown, confuses user about sin(pi) and cos(pi) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gcalctool in Ubuntu. https://bugs.launchpad.net/bugs/996481 Title: gcalctool default angle unit not shown, confuses user about sin(pi) and cos(pi) Status in “gcalctool” package in Ubuntu: New Bug description: Description: When I tried to find the value for sin(pi) and cos(pi), after changing the conversion into "radians" I got the results as,for cos(pi)=0.99849715 and for sin (pi)=0.054803665.which is a invalid one,The actual value for cos(pi) is -1 and for sin (pi) is 0. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcalctool/+bug/996481/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
