Need getting the answer and can someone plz explain ?

i think this could be a possible answer (1 / 84) -1

good luck! : d

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92

your answer is  

d.

196.5 m2

step-by-step explanation:

if the angular bisector of an triangle bisects the opposite side, prove that the other two sides are equal.