Formule Trigonometrice

Subiect: Formule Trigonometrice Dum Oct 19, 2008 10:38 am

Formule pentru sinus, cosinus, tangenta si cotangenta

Formule pentru sin(a+b), cos(a+b), sin(a-b), cos(a-b) ;

cos (a - b) = cos a * cos b + sin a * sin b

cos (a + b) = cos a * cos b - sin a * sin b

sin (a - b) = sin a * cos a - sin b * cos b

sin (a + b) = sin a * cos a + sin b * cos b

sin ( 0x01 graphic
- x) = cos x

cos ( 0x01 graphic
- x) = sin x

tg (a + b) = 0x01 graphic

tg (a - b) = 0x01 graphic

Formule pentru dublul unui unghi

sin 2x = 2 sin x cos x

cos 2x = cos2x - sin2x

cos 2x = 1 - 2 sin2x

cos 2x = 2 cos2x - 1

tg 2x = 0x01 graphic

ctg 2x = 0x01 graphic

Formule pentru jumatatea unui unghi

sin 0x01 graphic
= ± 0x01 graphic

cos 0x01 graphic
= ± 0x01 graphic

tg 0x01 graphic
= ± 0x01 graphic

tg 0x01 graphic

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