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Mathematics, 12.07.2019 13:10 koolgurl2003

Sin a - 2sin 2a + sin 3a/cos a - 3cos 2a + cos 3a
can someone pls me asap ? ? i need this on sunday
if the question is wrong then it's ok !

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Sin a - 2sin 2a + sin 3a/cos a - 3cos 2a + cos 3a
can someone pls me asap ? ? i need this on s...
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