Trig Identities

  • Thread starter iamthegelo
  • Start date
  • #1
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Homework Statement



By using trig formulas show that,

sin(2x + pi/3) = sin(2x) + sin(2(x+pi/3))

Homework Equations



Trig Identities

The Attempt at a Solution



I've used double angle formulas, sin(a+b) formulas, I just can't seem to get it.
 

Answers and Replies

  • #2
CompuChip
Science Advisor
Homework Helper
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It does look like a case for sin(a + b). Can you show us what went wrong when you simply apply the identity for sin(a + b) = sin(a) ... + ... to sin(2x + pi/3) ?
 
  • #3
lurflurf
Homework Helper
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write (for the left hand side)
sin(2x + pi/3)=[sin(2x + pi/3)-sin(2x +2pi/3)]+sin(2(x + pi/3))
recall the identity for
sin(a)-sin(b)
 

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