How do you find the exact functional value tan 165 using the cosine sum or difference identity?
2 Answers
Sep 21, 2015
Explanation:
Sep 21, 2015
Find tan (165)
Ans:
Explanation:
Apply the trig identity:
tan (165) = tan (45 + 120).
Trig table gives --> tan 45 = 1;
Check by calculator: tan (165) = - 0.27