change sin 2A to sin(A+A)to show that sin 2A=2 sin A cosA?

1 ⤊

ITS TO DO WITH TRIGONOMETRY!!!!!

2006-11-25 08:57:16 · 3 answers · asked by . 2 in Science & Mathematics ➔ Mathematics

sin(2A)=sin(A+A)=sinAcosA + sinAcosA=2sinAcosA

2006-11-25 09:03:45 · answer #1 · answered by albert 5 · 0⤊ 0⤋

You don't say?

The formula for sin(a+b) is

sin(a + b) = sina cosb + cosa sinb

right?

so

sin(A + A) = sinA cosA + cosA sinA = 2 sinA cosA

2006-11-25 17:01:07 · answer #2 · answered by Jim Burnell 6 · 1⤊ 0⤋

this is with trigonometry identify i will give you a formula for it i have one write me for it

2006-11-25 17:04:40 · answer #3 · answered by mariarosina 2 · 0⤊ 0⤋