[اللؤلؤه الورديه]

Find each of the following functions and their domains.
f(x) = 2 - 4x
g(x) = cos(x)
(a) f g = 1 تحصيل

2
(-, )
x > 4
x 0
(-, 2]
.

(b) g f = 3 تحصيل

4
x > 4
(-, 2]
(-, )
x 0
.

(c) f f = 5 تحصيل

6
x > 4
(-, 2]
(-, )
x 0
.

(d) g g = 7 تحصيل

8
x 0
x > 4
(-, )
(-, 2]
.
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