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to phrases
формулы приведенияstresses
geom. phase shift identities (в тригонометрии: правила вроде sin (90 + a) = cos a; For examples, google \ trigonometric phase shift identities \ CopperKettle)
math. reduction formulas
формула приведения
tech. reduction formula
формулы приведения: 5 phrases in 4 subjects
Astronomy1
Makarov2
Mathematics1
Technology1

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