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• 8 Simplifying $ 2\cos^2(x)\sin^2(x) + \cos^4(x) + \sin^4(x)$
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• 8 How to integrate ${x^3}/(x^2+1)^{3/2}$?
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• 7 Integration with a constant "a": $ \int_0^a \frac1{\sqrt {a^2-x^2}} dx $
• 7 Antiderivative problem
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