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Precalculus Examples
Popular Problems
Precalculus
Solve for x y=cos(x)
y
=
cos
(
x
)
Step 1
Rewrite the
equation
as
cos
(
x
)
=
y
.
cos
(
x
)
=
y
Step 2
Take the
inverse
cosine
of both sides of the
equation
to extract
x
from inside the
cosine
.
x
=
arccos
(
y
)
(
(
)
)
|
|
[
[
]
]
√
√
≥
≥
7
7
8
8
9
9
≤
≤
°
°
θ
θ
4
4
5
5
6
6
/
/
^
^
×
×
>
>
π
π
1
1
2
2
3
3
-
-
+
+
÷
÷
<
<
∞
∞
,
,
0
0
.
.
%
%
=
=
[
x
2
1
2
√
π
∫
x
d
x
]
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