Asked by stacey graham

verify the identity sin(4u)=2sin(2u)cos(2u)

15 years ago

Answered by Reiny

LS
=sin(4u)
= sin(2u + 2u)
= sin(2u)cos(2u) + cos(2u)sin(2u)
= 2sin(2u)cos(2u)
= RS

15 years ago

Answered by sachin

Good

9 years ago

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