V
e
r
i
f
y
t
h
a
t
y
=
e
m
cos
-
1
x
i
s
a
s
o
l
u
t
i
o
n
o
f
t
h
e
d
i
f
f
e
r
e
n
t
i
a
l
e
q
u
a
t
i
o
n
.
(
1
-
Mixed-up sentence exercise
Put the parts in order to form a sentence. When you think your answer is correct, click on "Check" to check your answer. If you get stuck, click on "Hint" to find out the next correct part.
Check
Undo
Restart
Hint
OK