Stuck on question 9.

Definition: es. this is a disadvantage or weak point that makes someone or something less effective.

Subtract 8 1/6 - 4 5/6 . simplify the answer and write as a mixed number.

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β