Question

Please help? Evaluate: (tan37degrees+tan23degrees)/(1-tan37degrees tan23degrees)
The second step is equal to?
a. 1/tan(37degrees - 23degrees)
b. tan(37degrees - 23degrees)
c. tan(37degrees + 23degrees)
d. 1/tan(37degrees + 23degrees)

Answer 1

I think the identity \(\large tan (a \pm b) = \frac{tana \pm tanb}{1\mp tanatanb}\) Can help you
Put a = 37 degrees and b = 23 degrees, observe the signs and get your answer!

Answer 2

Thanks so much! I got c. :)

Answer 3

Welcome :)