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Sine series and cosine series/Beginning/Circle formula/Exercise
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Compute
(
1
−
1
2
X
2
+
1
24
X
4
)
2
+
(
X
−
1
6
X
3
+
1
120
X
5
)
2
.
{\displaystyle {\left(1-{\frac {1}{2}}X^{2}+{\frac {1}{24}}X^{4}\right)}^{2}+{\left(X-{\frac {1}{6}}X^{3}+{\frac {1}{120}}X^{5}\right)}^{2}.}
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