S=1/2ͱh=1/2(1/4ͱ2+h2)sinθ 1/2αβsinθ'=√s(s−(√1/4ͱ2+h2))2(s−ͱ) θ>θ' T.theodor 2022.11.30.

α+γ≦180° β+δ≦180° T.theodor 2022.11.30.

(asinθ+bcosθ)n=(√a2+b2)n(sinθcosφ+cosθsinφ)n sinn(θ+φ)=(asinθ+bcosθ)n/(√a2+b2)n T.theodor 2022.11.28.

f(x)=axn+bxn-1…+z α'=1 α=2 T.theodor 2022.11.30.