Cos30-cos40=0 sin30+sin40=980 - Office Equipment & Supplies

Your calculator is probably set to Radians or Gradians rather than Degrees.


http://support.casio.com/manualfile.php?rgn=5&cid=004002005

This manual explains how to change to mode to Degrees.

http://support.casio.com/pdf/004/fx_plus_ch_gett.pdf

Good luck.

Paul

Your calculator is set the measure angles in grads. To change this, press the MODE button one or more times until you see a line saying "Deg Rad Gra". Press 1 to select degrees or 2 to select radians.

Hi rowanwah

The sine of an angle is only applicable is a right triangle. If you just want a number, ie, the actual value of the sine 15 degrees you can look it up on Google. Do a search for "sine and cosine functions"

If you want the mathematical description of the sine of an angle it is described as follows
In a triangle ABC, there are 3 angles angle A, angle B and angle C. There are also 3 sides, Side AB, Side AC and side BC. The sine of angle A is equal to the side opposite Angle A divided by the Hypotenuse (the longest side opposite the right angle)
The Cosine of angle A is equal to the side adjacent to Angle A divided by the hypotenuse

Hope this helps Loringh PS Please leave a rating for me Thanks