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4
z
=
p
q
.
p
2
=
q
z
.
9
(
p
2
z
+
q
2
)
=
4.
q
2
=
z
2
p
2
(
1
−
p
2
)
.
p
q
=
x
m
y
n
z
l
.
cos
(
x
+
y
)
p
+
sin
(
x
+
y
)
q
=
z
+
z
1
p
−
2
q
=
3
x
2
sin
(
y
+
2
x
)
.
xp
+
y
q
=
z
−
a
√
x
2
+
y
2
+
z
2
.
z
=
e
ax
+
b
y
f
(
ax
−
b
y
)
.
ϕ
(
x
2
+
y
2
+
z
2
,
x
y
z
)
=
0.
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