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basic math question, google am suck

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teh_pwn

"Saturated fat causes heart disease as much as Brawndo is what plants crave."
So I'm studying for a Signals and Systems exam and I can't seem to remember the simplest of trig problems.

How do you calculate the period of two sinusoids mutliplied together?

ie

sin(2 pi f t) .* cos (2 pi f t)

f being the frequency
t being the varible (time)
pi is that 3.14 thing

I know that with addition it's the LCM of the periods, but I don't know about products.
 
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