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View Full Version : Proving trig identities solver

fionasdad
Nov 20, 2012, 01:16 PM
sin(4x)=(4sin(x)cos(x))(1-2sin^2x) prove the identity
9015933
Nov 20, 2012, 01:48 PM
(1-2sin^2x)=cos(2x)
2sin(x)cos(x)=sin(2x)
===> (4sin(x)cos(x))(1-2sin^2x)=sin(4x)