计算[0,π/2]∫dΘ[0-cosΘ]∫rdr,

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/19 23:05:51
计算[0,π/2]∫dΘ[0-cosΘ]∫rdr,计算[0,π/2]∫dΘ[0-cosΘ]∫rdr,计算[0,π/2]∫dΘ[0-cosΘ]∫rdr,∫[0,π/2]dΘ∫[0-cosΘ]rdr=∫[

计算[0,π/2]∫dΘ[0-cosΘ]∫rdr,
计算[0,π/2]∫dΘ[0-cosΘ]∫rdr,

计算[0,π/2]∫dΘ[0-cosΘ]∫rdr,
∫[0,π/2]dΘ∫[0-cosΘ]rdr
=∫[0,π/2]1/2r² |[0-cosΘ] dΘ
=1/2∫[0,π/2]cos²Θ] dΘ
=1/4∫[0,π/2](1+cos2Θ) dΘ
=1/4(Θ+1/2sin2Θ) |[0,π/2]
=π/8