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Make the number π look sexier by expressing it equivalently or approximately in an expression of numbers or/and constants—for example, π = 1 – 1/3 + 1/5 – 1/7 + 1/9 – 1/11 + ⋯, π ≈ √2 + √3, π⁴ + π⁵ ≈ e⁶, and π rad = 180°.
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