Number 2. i don't understand pls :
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Mathematics, 29.07.2019 10:10 brooklynmikestovgphx
Number 2. i don't understand pls :
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Mathematics, 21.06.2019 23:40, haybales6019
Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me
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