Asked by Veronica
How do you express sin4x as a trigonometric function of x?
Answers
Answered by
Damon
use angle identities
sin 2a = 2 sin a cos a
cos 2a = co^2a - sin^2 a
use them once for a = 2x
then again for a = x
sin 2a = 2 sin a cos a
cos 2a = co^2a - sin^2 a
use them once for a = 2x
then again for a = x
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