# Precalculus

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)]]

1. Hint: use the following trigonometric identity
tan(a+b)=(tan(a)+tan(b))/(1-tan(a)tan(b))

posted by MathMate

## Similar Questions

1. ### Math- Precalculus

Write the expression as the sine, cosine, tangent of an angle (in radians.) (tan(pi/5)-tan(pi/3))/(1+tan(pi/5)tan(pi/3))
2. ### precalculus

Write each expression as sine, cosine, or tangent of an angle. Then find the exact value of the expression tan 50-tan20/1+ tan 50 tan20
3. ### trig

Write the expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the expression. 2tan 2pi/3 / 1-tan^2 2pu/3
4. ### math

Write the given expression as the tangent of an angle. tan 7x − tan x/ 1 + tan 7x tan x
5. ### trigonometric functions

im compeletely lost with the trigonometric functions...can anyone explain clearly to me? Are you lost on the definitions?...where is the problem. You need to be able to draw and label all the parts of a triangle, the hypotenuse
6. ### math

Write the following expression as the sine, cosine, or tangent of an angle: cos45°cos120° - sin45°sin120°
7. ### Trigonometry

Hello, everyone: I am working on finding the exact values of angles that are less common and are therefor not found easily on the Unit Circle (at least, they are not labeled). For example, the problem I am asking about is: 10)
8. ### precalculus

write each expression as the sine, cosine or tangent of a double angle. then find the exact value of the expression. a. 2sin 22.5 cos 22.5 b. cos^2 105- sin^2 105
9. ### Pre calc

Use the half-angle formulas to determine the exact values of the sine, cosine, and tangent of the angle. 67° 30' 7 sin(67° 30')= cos(67° 30')= 4 tan(67° 30')=
10. ### cosine and sine HELP!

Simplify and write the trigonometric expression in terms of sine and cosine: ((2+tan^2 x)(sec^2 x))-1 = (f(x))^2 f(x)= ???

More Similar Questions