17/11/26 13:46:53.68 b02GGEMo.net
>>23
ついでに、
(面積）=（1/2)∫ r^2 dθ
=（1/2)∫｛sin(θ/4)}^8 dθ
= ∫｛35 -56cos(θ/2）+28cosθ -8cos(3θ/2）+cos(2θ)}/256 dθ
=｛35θ -112sin(θ/2）+28sinθ -(16/3)sin(3θ/2) +(1/2)sin(2θ)}/256,
θ=π のとき、5(21π-64)/768 = 0.012848
17/11/26 13:46:53.68 b02GGEMo.net
>>23
ついでに、
(面積）=（1/2)∫ r^2 dθ
=（1/2)∫｛sin(θ/4)}^8 dθ
= ∫｛35 -56cos(θ/2）+28cosθ -8cos(3θ/2）+cos(2θ)}/256 dθ
=｛35θ -112sin(θ/2）+28sinθ -(16/3)sin(3θ/2) +(1/2)sin(2θ)}/256,
θ=π のとき、5(21π-64)/768 = 0.012848