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OpenStudy (anonymous):
cosx*cos3x-sinx*sin3x=0
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OpenStudy (dumbcow):
use these identities: http://en.wikipedia.org/wiki/List_of_trigonometric_identities#Product-to-sum_and_sum-to-product_identities
OpenStudy (dumbcow):
i would simplify equation to this: \[\tan x \tan 3x = 1\]
OpenStudy (dumbcow):
do you have questions, or can you get the solution now?
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