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Mathematics
Problem
State the identity that expresses
sin
(
x
+
y
)
\sin(x+y)
sin
(
x
+
y
)
in terms of
sin
x
,
cos
x
,
sin
y
\sin x,\;\cos x,\;\sin y
sin
x
,
cos
x
,
sin
y
and
cos
y
\cos y
cos
y
.
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