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Trigonometry Examples
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Trigonometry
Expand the Trigonometric Expression cos(3x)
cos
(
3
x
)
cos
(
3
x
)
Step 1
Use the triple-
angle
identity
to transform
cos
(
3
x
)
cos
(
3
x
)
to
4
cos
3
(
x
)
−
3
cos
(
x
)
4
cos
3
(
x
)
-
3
cos
(
x
)
.
4
cos
3
(
x
)
−
3
cos
(
x
)
4
cos
3
(
x
)
-
3
cos
(
x
)
⎡
⎢
⎣
x
2
1
2
√
π
∫
x
d
x
⎤
⎥
⎦
[
x
2
1
2
π
∫
x
d
x
]
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