2007-10-20 02:56:17 · 8 answers · asked by sai v 1 in Science & Mathematics ➔ Mathematics
what do you mean? 2A?
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2007-10-20 02:58:06 · answer #1 · answered by Anonymous · 0⤊ 0⤋
capital letters are for angles. So might be 2A stands for twice the angle A as in Sin2A. A is angle opposite to side a in triangle abc
2007-10-20 09:59:52 · answer #2 · answered by Anonymous · 1⤊ 0⤋
THe first thing that comes to mind would be to see that buried in say..Sin2(A)..Which would naturally mean the sine function of two times an angle..Or cos (2A).
hope this helps
2007-10-20 10:01:14 · answer #3 · answered by RScott 3 · 0⤊ 0⤋
2A = 2 times the angle
So the identity for sin2a is sin 2A=2sinAcosA
So if you were finding sin60 and you knew
sin30=1/2 cos30=sqrt3/2
sin (2*30)=2sin(30)(cos30)
sin60=2(1/2)(sqrt3/2)
sin 60=sqrt3/2
2007-10-20 10:06:44 · answer #4 · answered by Shaun B 3 · 0⤊ 0⤋
What do you mean?
sin (2A) = 2 sin(A) cos(A)
cos (2A) = cos^2 (A) - sin^2 (A)
cos (2A) = 2cos^2 (A) - 1
cos (2A) = 1 - 2sin^2 (A)
Something like that? Guess they're double angle identities...
2007-10-20 10:03:47 · answer #5 · answered by Lucky 4 · 0⤊ 0⤋
2a = 2 * a ... default mode is Radians for compatibility for default trigonometric function
2007-10-20 10:01:14 · answer #6 · answered by Anonymous · 0⤊ 0⤋
two times the value of A, you can safely reduce that modulo 2 times pi
2007-10-20 09:58:30 · answer #7 · answered by gjmb1960 7 · 0⤊ 0⤋
Sorry...Don't know. :(
2007-10-20 09:57:44 · answer #8 · answered by Anonymous · 0⤊ 1⤋