Question

Express tan(23°−21°) in terms of tangents of 23∘and 21∘ You do NOT need to type in the degree symbol. Be sure to PREVIEW your answer before submitting!

Answer 1

tan(23° -21°) = (tan(23°) -tan(21°))/(1 +tan(23°)tan(21°))

Explanation:

The formula for the tangent of the difference of angles is ...

tan(a-b) = (tan(a) -tan(b))/(1 +tan(a)tan(b))

Filling in the values a=23° and b=21°, you get the formula shown above.