trig problem?

2 ⤊

Can I split the expression sin(x+a) into (sin x) + (sin a), and if I can't, how can I modify it? I need to get a (sin x) from somewhere =D

2007-06-17 11:25:20 · 3 answers · asked by seb 1 in Science & Mathematics ➔ Mathematics

a ϵ Ɍ, and a is a fixed number

2007-06-17 11:28:59 · update #1

3 answers

No, you cannot do that. The formula for relating these quantitites is:
sin(x + a) = sin(x)cos(a) + cos(x)sin(a).
Alternatively:
sin(x) + sin(a) = 2sin[ (x + a)/2 ]cos[ (x - a)/2 ].

2007-06-17 11:28:57 · answer #1 · answered by Anonymous · 2⤊ 0⤋

First answer is NO!
sin (x + a) = sin x.cos a + cos x.sin a

2007-06-17 20:24:10 · answer #2 · answered by Como 7 · 0⤊ 0⤋

sin(x-a)=sinx cosa-cosxxsina.

2007-06-17 11:36:10 · answer #3 · answered by Anonymous · 0⤊ 0⤋