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/sci/ - Science & Math

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>> No.2348472 [View]
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2348472

dude, (c^4-s^4) simplifies to (c^2-s^2)(c^2+s^2)
so u have (c^2-s^2)(c^2+s^2)/(c^2-s^2)= (c^2+s^2)

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