math functions are inaccurate as shown below. sin 68 is 0.927183855. Calc returns a value of -0.897927681 cos 68 is 0.374606593. Calc returns a value of 0.440143022 tan 68 is 2.475086853. Calc returns a value of -2.040081598 The sin and cos errors have a serious affect on a business application that I use so I have marked them "major". I have not checked any other functions. The calculator in Ubuntu agrees with my scientific calculator but Libre Office does not.
From https://help.libreoffice.org/Calc/Mathematical_Functions#SIN SIN Returns the sine of the given angle (in radians). Syntax: SIN(number) Returns the (trigonometric) sine of number, the angle in radians. To return the sine of an angle in degrees, use the RADIANS function. Example: SIN(PI()/2) returns 1, the sine of PI/2 radians. SIN(RADIANS(30)) returns 0.5, the sine of 30 degrees. You can convert between the two with the following formula: 1 pi radian = 180 deg. This is the same in all office suites. http://office.microsoft.com/en-us/excel-help/sin-HP005209257.aspx