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Mathematics 21 Online
OpenStudy (anonymous):

use the product to sum formula to write the given product as a sum or difference. 10sin(pie/10)cos(pie/10)

OpenStudy (anonymous):

5 sin (pi/10 +pi/10)

OpenStudy (dumbcow):

This comes from trig identity: sin(2x) = 2sin(x)cos(x)

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