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3π/4 ≤ θ ≤ π, arcsin(sinθ) = θ 错误。
只有 -π/2 ≤ θ ≤ π/2, arcsin(sinθ) = θ 才正确。
3π/4 ≤ θ ≤ π, arcsin(sinθ) = π - θ,
例如 θ = 5π/6 时,sinθ = 1/2,
arcsin(1/2) = π - 5π/6 = π/6 正确,arcsin[sin(5π/6)] = 5π/6 错误。
补充解答:本题应这样做:
当 3π/4 ≤ θ ≤ π 时,
∫<3π/4, π> [arcsin(r/2)]<0, 2sinθ> dθ = ∫<3π/4, π> arcsin(sinθ) dθ
= ∫<3π/4, π>(π - θ)dθ = [πθ - θ^2/2]<3π/4, π>
= π^2 - π^2/2 - 3π^2/4 + 9π^2/32 = π^2/32.
只有 -π/2 ≤ θ ≤ π/2, arcsin(sinθ) = θ 才正确。
3π/4 ≤ θ ≤ π, arcsin(sinθ) = π - θ,
例如 θ = 5π/6 时,sinθ = 1/2,
arcsin(1/2) = π - 5π/6 = π/6 正确,arcsin[sin(5π/6)] = 5π/6 错误。
补充解答:本题应这样做:
当 3π/4 ≤ θ ≤ π 时,
∫<3π/4, π> [arcsin(r/2)]<0, 2sinθ> dθ = ∫<3π/4, π> arcsin(sinθ) dθ
= ∫<3π/4, π>(π - θ)dθ = [πθ - θ^2/2]<3π/4, π>
= π^2 - π^2/2 - 3π^2/4 + 9π^2/32 = π^2/32.
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您好,那这道题应该怎么做呢?
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