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Trigonometry Examples
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Trigonometry
Expand the Trigonometric Expression cos(x+y)
cos
(
x
+
y
)
Step 1
Apply the
sum
of
angles
identity
cos
(
x
+
y
)
=
cos
(
x
)
cos
(
y
)
-
sin
(
x
)
sin
(
y
)
.
cos
(
x
)
cos
(
y
)
-
sin
(
x
)
sin
(
y
)
[
x
2
1
2
√
π
∫
x
d
x
]
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