If m(6,9) is the midpoint of the line segment ab, and if a has coordinates (3,5), find the coordinates of b.
a). (-7,-12)
b). (9,-13)
c). (-5,-5)
d). (9,13)
e). (-9,13)

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