2006-10-21 15:41:50 · 5 answers · asked by SOS 1 in Science & Mathematics ➔ Mathematics
tringle with a,b,c sides, their opposite angles are A,B,C.
law of cosines : c^2=a^2+b^2-2.a.b.cosC or cosC=(a^2+b^2-c^2)/2ab
(for C=Pi/2=90° : cosC=0....c^2=a^2+b^2)
2006-10-22 14:35:18 · answer #1 · answered by Majdi B 3 · 0⤊ 0⤋
The cosine function gives the x coordinate of where a ray, at a certain angle, from the centre of the unit circle hits the outside.
cos(0) = 1
cos(pi/2) = 0
cos(pi) = -1
2006-10-21 22:47:54 · answer #2 · answered by jacinablackbox 4 · 0⤊ 0⤋
Do you mean the law of cosines? Or do you meand Cosin's theorem or possibly Lusin's theorem?
2006-10-21 22:51:06 · answer #3 · answered by raz 5 · 0⤊ 0⤋
You have to be more specific...by the way it is: COSINE
2006-10-22 01:18:16 · answer #4 · answered by csulbalgebra 2 · 0⤊ 0⤋
what is cosinus?
2006-10-21 23:26:27 · answer #5 · answered by animal 2 · 1⤊ 0⤋