Math CentralQuandaries & Queries


Question from Conor, a student:

sinx= 6/10 ; Find the exact value of cos(squared) x / 1-tanx

Thanks again


You need to know some relationships among trig functions in order to solve this as well as similar problems. First you need to know how to write the trig functions in terms of the sine and cosine functions.

tan(x) = sin(x)/cos(x)
sec(x) = 1/cos(x)
and so on.

There are a few other relationships that are worthwhile remembering. Among them is

sin2(x) + cos2(x) = 1.


About Math Central


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.
Quandaries & Queries page Home page University of Regina PIMS