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Itel
Group Title
Help please
Verify the identity.
cos 4x + cos 2x = 2  2 sin^2 2x  2 sin^2 x
 one year ago
 one year ago
Itel Group Title
Help please Verify the identity. cos 4x + cos 2x = 2  2 sin^2 2x  2 sin^2 x
 one year ago
 one year ago

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shining Group TitleBest ResponseYou've already chosen the best response.1
cos 4x = 2cos^2 2x  1 cos 2x = 2cos^2 x 1 result:22sin^ 2x  2sin^2 x
 one year ago

Itel Group TitleBest ResponseYou've already chosen the best response.0
so 2cos^2 2x  1 + 2cos^2 2x  1= 22sin^ 2x  2sin^2 x?
 one year ago

asnaseer Group TitleBest ResponseYou've already chosen the best response.0
do you know how to express \(\cos(2x)\) in terms of \(\sin(x)\)?
 one year ago

asnaseer Group TitleBest ResponseYou've already chosen the best response.0
using the doubleangle formulae
 one year ago

shining Group TitleBest ResponseYou've already chosen the best response.1
yes , you should first optimize it wheter you know double angle formulas or not?
 one year ago

Itel Group TitleBest ResponseYou've already chosen the best response.0
so am I right then? That so 2cos^2 2x  1 + 2cos^2 2x  1= 22sin^ 2x  2sin^2 x?
 one year ago

shining Group TitleBest ResponseYou've already chosen the best response.1
yes , it was great
 one year ago
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