XL98: How to Find Secant, Cosecant, or Cotangent of an Angle

ID: Q188082

The information in this article applies to:

Microsoft Excel 98 Macintosh Edition

SUMMARY

Microsoft Excel 98 Macintosh Edition has built-in functions for a large number of Trigonometric functions, but does not include all such functions. However, those not included may be derived from existing functions by using a formula in Microsoft Excel 98 Macintosh Edition.

Some functions that may be derived from built-in Excel functions include:


   secant (SEC)
   cosecant (CSC)
   cotangent (COT)

These functions are the inverse of the cosine, sine, and tangent, respectively. To calculate these additional functions where "angle" is the measure of the angle in radians, use the following formulas:


   SEC(angle) = 1/COS(angle)

   CSC(angle) = 1/SIN(angle)

   COT(angle) = 1/TAN(angle)

For example, to find the cotangent of a 30 degree angle, use the following formula:


   =1/TAN(30*PI()/180)

NOTE: To convert an angle from degrees to radians, multiply the angle in degrees by PI()/180.

MORE INFORMATION

For additional information on converting degree angles to radians, please see the following article in the Microsoft Knowledge Base:

Q41064 XL: Trigonometric Functions Returning Incorrect Values

REFERENCES

For more information about trigonometry functions, click Contents And Index on the Help menu (or on the Balloon Help menu if you are using a version of the Macintosh operating system earlier than 8.0), click the Index button in Excel Help, type the following text

trigonometry functions

and then click Show Topics. Select the "About math and trigonometry functions" topic, and click Go To. If you are unable to find the information you need, ask the Office Assistant.

Additional query words: XL98

Keywords : kbdta xlformula
Version : MACINTOSH:98
Platform : MACINTOSH
Issue type : kbhowto