Posted by Angela on .
The directions are write the expression as the sine, coine, or tangent of an angle.
(tan 25 degrees + tan 10 degrees) / [1  [(tan 25 degrees)(tan 10 degrees)]]

Precalculus 
MathMate,
Hint: use the following trigonometric identity
tan(a+b)=(tan(a)+tan(b))/(1tan(a)tan(b))