Question

prov that sin3A=?

Answer 1

This is not a proof ?

Answer 2

sin3A= something which we have to prove ?

Answer 3

@mustry Please reply ?

Answer 4

Prove sin3A=?
sin3A=sin(A+2A)
use
sin(A+B)=sinAcosB+cosAsinB
sin2A=2sinAcosA

Answer 5

good

Answer 6

actually u know

Answer 7

no ur suppose to expand it

Answer 8

sin(2A+A)=sin2AcosA+cos2AsinA

Answer 9

BUT cos2A=cos^A+sin^A

Answer 10

cos2A=cos^2A-sin^2A
=1-2sin^2A
=2cos^2A-1

Answer 11

OKAY put it in the equestn

Answer 12

ur r8