ashleyfay2013 ashleyfay2013
  • 07-08-2024
  • Mathematics
Answered

Use double-angle formulae to show that:

a) 2 sin (4π/5) cos (π/5) = sin (2π/5)
b) cos² (4π/7) - sin² (3π/7) = cos (6π/7)



Answer :

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