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BhAskaraH

Sin approximations

Bhaskara I in 7th century derived this formula to calculate Sine of any angle between 0 and 180 degrees -

sin(θ°) ≈ 4θ(180 - θ) / (40500 - θ(180 - θ))

It’s extremely accurate. Likely derivation by interpolation.

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Aradhana Anand’s vids -