What does f(3) equal?

for n=2, f(2)=f(1)*(-1/2)   we know that f(1)= -16 so put it

f(2)=(-16)*(-1/2)=8

then put n=3 so f(3)=f(2)*(-1/2)

f(3)=8*(-1/2)=  -4

Step-by-step explanation:

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