Provides Bhaskara I's sine approximation formula
bsin(θ) = 16(π-θ)θ / (5π^2 - 4(π-θ)θ) # error < 0.002, θ ∈ [0,π]There is also b2sin(θ) for θ ∈ [-π,π], and Bhaskara.sin(θ) for θ ∈ 𝐑,
by inserting appropriate mod(,2π) and sign()*abs() bits.
Similarly bcos(θ) is for θ ∈ [-π/2,π/2], and Bhaskara.cos(θ) for all θ ∈ 𝐑.
