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• 19 Is there a general rule for determining the direction of tension force?
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• 7 Prove that $\int_1^a \frac{T_n(x) T_n(x/a)}{\sqrt{a^2 - x^2} \sqrt{x^2 - 1^2}} \frac{a}{x} \mathrm{d}x = \frac{\pi}{2}$
• 7 Inverting an equation involving a sum of shifted functions
• 6 Java: how can I make the return type, of an inherited method in a subclass, the same as the subclass?
• 6 Dropping Objects of Different Masses
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