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calculus - How does $dV=2\pi R^2t \sin \theta\, d\theta$ come? - Mathematics Stack Exchange
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Why circumference of a circle is 2πr and area is πr^2 ?
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Area of a circle - Wikipedia
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prove that [2 pie r=n lambda] the circumference of the bohr orbit for the hydrogen atom is an integral multiple of the de brogli wavelength
