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✔ 9 اتحاد مهم
sin2x = 2 sinx cosx
cos2x = cos^2 x -sin^2 x = 1-2 sin^2 x = 2 cos^2 x -1
sin^2 x = (1- cos 2x) / 2
cos^2 x = (1+ cos 2x)/ 2
sin 2x = 2tgx / (1+ tg^2 x )
cos 2x = (1-tg^2 x) / (1+ tg^2 x)
tg 2x = 2 tg x / ( 1- tg^2 x)
( a+b )^3 = a^3 + b^3 + 3ab (a+b)
(a-b)^3 = a^3 - b^3 - 3ab (a-b
sin2x = 2 sinx cosx
cos2x = cos^2 x -sin^2 x = 1-2 sin^2 x = 2 cos^2 x -1
sin^2 x = (1- cos 2x) / 2
cos^2 x = (1+ cos 2x)/ 2
sin 2x = 2tgx / (1+ tg^2 x )
cos 2x = (1-tg^2 x) / (1+ tg^2 x)
tg 2x = 2 tg x / ( 1- tg^2 x)
( a+b )^3 = a^3 + b^3 + 3ab (a+b)
(a-b)^3 = a^3 - b^3 - 3ab (a-b
