Express cosx in terms of other trigonometric functions

mjonascu

New member
Joined
Mar 18, 2012
Messages
4
How do I express cosx in terms of tan, cot, and csc? Each expression should contain exactly one function other than cosine. Assume that x is in Q1. Thanks
 
Last edited:
How do I express cosx in terms of tan, cot, and csc? Each expression should contain exactly one function other than cosine. Assume that x is in Q1. Thanks

\(\displaystyle tan(x) \ = \ \dfrac{sin(x)}{cos(x)}\)

Please share your work with us indicating exactly where you are stuck - so that we may know where to begin to help you.
 
I need to express Cos in terms of tan, cot, and csc. For example: cosx in terms of sin would be sin(90-x).
 
I need to express Cos in terms of tan, cot, and csc. For example: cosx in terms of sin would be sin(90-x).

You still did not show any work!!

Further hints:

Do you know the relationship between cos(x) and sec(x)?

Do you know the relationship between tan(x) and cos(x)?

How can you use the above relationships to your advantage?
 
Top