OT Easy maths help (again)

[Mark]

This is becoming a weekly event!
OK, this week I'm plotting a graph and the somehow I managed to mess up my calculator and I'm getting different answers from last night.
I would be really grateful if anyone could just double check my answer.

2Sin(2*30-35)

Last night I had -0.264 and tonight I'm getting 0.845.

I think I've played around with the mode thing on my calculator and dont know which one of correct now.

 

[Bill]

It's because you have been changing between degrees and radians.

-0.264 is when using radians

0.845 is when using degrees.

I expect you need degrees so 0.845 is your answer.

 

[Mark]

Yeah that would be it because the 35 in the question is degrees. Just have to work out how to switch it back now lol.

Thanks for the help, Mark.

 

[Bill]

Usually keep pressing the MODE button to toggle through settings and see something like

D R G
1 2 3

Then press 1 for Degrees.

 

[Mark]

OK, think I've got it. Any chance you could check out anoth just to make sure.

3Cos((3*30/2)+60)