ÅÐÇ ßÇä (sin (x+y) = cos (x+y ÝÃËÈÊ Ãä
(tan x = ( 1- tan y ) / ( 1 + tan y
ÅÐÇ ßÇä (sin (x+y) = cos (x+y ÝÃËÈÊ Ãä
(tan x = ( 1- tan y ) / ( 1 + tan y
ÇáÐíä íÔÇåÏæä ÇáãæÖæÚ ÇáÂä: 1 (0 ãä ÇáÃÚÖÇÁ æ 1 ÒÇÆÑ)
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