Question

Find the expansion tan(A-B-C

Answer 1

Answer:

By using the formula of tan (α + β) we can easily expand tan (A + B + C). Let us recall the formula of tan (α + β) = tan α + tan β/1 - tan α tan β. Therefore, the expansion of tan (A + B + C) = tan A + tan B + tan C - tan A tan B tan C/ 1 - tan A tan B- tan C tan A - tan B tan C.