# Calculating Error

4 replies to this topic

### #1 Toopz

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Posted 20 May 2016 - 03:46 PM

I have a 9860g and my son was using it to solve trigonometry equations. When used the cos tan and sine functions the answers came up totally different and wrong to the answer I received using another calculator I checked it several times as to why cos 45 answer on my 9860g was different to the cos45 answer I got on another calculator . Can some one please explain why this has occurred. Any help will be appreciated

### #2 frankmar98

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Posted 20 May 2016 - 04:25 PM

Check the angle mode, for calculate the cos of 45 degree.

Also you have to know that equations containing trigonometry functions usually have infinite solutions

### #3 Toopz

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Posted 20 May 2016 - 10:53 PM

Thanks for the reply what's angle mode
Thanks what is angle mode
Thanks what is angle mode

### #4 Viliami

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Posted 21 May 2016 - 08:52 AM

On the fx-9860gii you can change the angle mode to: degrees, radians, or gradians.

Degrees are the most common measurement, 360 degrees make up a full circle.

Radians are also common in High School maths and beyond, 2π radians make up a full circle.

Gradians are not so common, gradians are equal to 9/10ths of a degree. 400 gradians make up a full circle.

To switch the angle mode between degrees, radians or gradians press , and then scroll down to Angle:, then press for Degrees, for Radians or for Gradians.

Edited by Viliami, 21 May 2016 - 08:53 AM.

### #5 Rhodie

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Posted 02 July 2019 - 06:48 AM

A common calculation error...

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