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kellzz

  • 3 years ago

express as sum or difference sin7xsin4x

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  1. casanovaxx
    • 3 years ago
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    -1/2 (cos (7x+4x)-cos(7x-4x))=-1/2 (cos(11x)-cos(3x))

  2. jishan
    • 3 years ago
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    |dw:1355050134503:dw|

  3. jishan
    • 3 years ago
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    |dw:1355050282249:dw|

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