PLEASE HELP, SOLVE THIS PROBLEM AND GIVE ME THE ANSWER!!!

B

Step-by-step explanation:

Recall that . In other words, we need to find first and then put that value into .

We need to find

you would use (d.) the law of cosines or a^2 = b^2 + c^2 – 2bc(cos a)

, b^2 = a^2 + c^2 – 2ac(cos b), or c^2 = a^2 + b^2 - 2ab(cos c). you wouldn't use b. the law of sines as it is mostly effective when 1side and 2angles are given. a and c aren't the answer for they are the improper versions of the law of cosines. hope this is .

hope this is what you were asking for!

step-by-step explanation: