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Itel
 3 years ago
Help please
Verify the identity.
cos 4x + cos 2x = 2  2 sin^2 2x  2 sin^2 x
Itel
 3 years ago
Help please Verify the identity. cos 4x + cos 2x = 2  2 sin^2 2x  2 sin^2 x

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shining
 3 years ago
Best ResponseYou've already chosen the best response.1cos 4x = 2cos^2 2x  1 cos 2x = 2cos^2 x 1 result:22sin^ 2x  2sin^2 x

Itel
 3 years ago
Best ResponseYou've already chosen the best response.0so 2cos^2 2x  1 + 2cos^2 2x  1= 22sin^ 2x  2sin^2 x?

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

asnaseer
 3 years ago
Best ResponseYou've already chosen the best response.0using the doubleangle formulae

shining
 3 years ago
Best ResponseYou've already chosen the best response.1yes , you should first optimize it wheter you know double angle formulas or not?

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