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Mathematics 72 Online
OpenStudy (anonymous):

solve by using to product formula cos(3theta)+cos(5theta)=cos(theta)

OpenStudy (anonymous):

use cos(3x) = cos(x+2x), and then double angle formula. Do this with both cos(3x) and cos(5x) to derive something in terms of sin and cos powers, from this you should be able to show the equality

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