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X =
240x + x^{2}
510y
?^{2}+?^{2}=?^{2}
(1+?)^{?} = 1+
??
1
+
(?(?−1) x ^{2}
2!
cos?+cos?=2 cos (½ (?+?)cos½ (?−?)
sin?±sin?=2 sin½ (?±?) cos½(?∓?))