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Sine/R/Series/Addition theorem/Exercise
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Prove the addition theorem
sin
(
x
+
y
)
=
sin
x
⋅
cos
y
+
cos
x
⋅
sin
y
{\displaystyle {}\sin(x+y)=\sin x\cdot \cos y+\cos x\cdot \sin y\,}
for the sine using the defining power series.
Create a solution