trigonometric function 0° < θ < 90°，0 < sinθ，cosθ < 1，0 < tanθ，tanθ ∈ ∞ lim sinθ = 1 ( θ →90° ) lim sinθ = 0 ( θ → 0° ) lim cosθ = 1 ( θ → 0° ) lim cosθ = 0 ( θ →90° ) lim tanθ = 0 ( θ → 0° ) lim tanθ = ∞ ( θ → 90° ) sinθ，cosθ，tanθ ≠…

Sn = 1/2n2+ 1/2 n y = 1/2x2+ x Sn ハ、 y = 1/2x2+ 1/2x 之 x 之整数値ヲ取ル。 T.theodor 2022.7.8

x2+ a2y2/b2 = a2 T.theodor 2022.7.16

y = ax 以外之関数ハ、curve ヲ取ル。 T.theodor 2022.7.16

x → √a ( x , f(x)) → ( √a , f(x)) T.theodor 2022.7.16