
New Member
The Cosine Curve
Hi there I would like to know how to do the following questions without drawing a graph. What is the formula?
The question: Express each of the following in terms of the cosine of another angle between 0° and 180°
a) cos 20°
b) cos 85°
Thank you for any help!

Elite Member
Originally Posted by
Xine
What is the formula?
There is no formula.
Treat the given angles as reference angles or use the symmetry of a unit circle.
If you have not been taught either of these concepts, let us know.
Cheers ~ Mark
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