高等数学,在线等
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设 x = asint
I = ∫ (asint)^2 acost dt / (acost) = a^2∫ (sint)^2 dt
= (a^2/2)∫ (1-cos2t) dt = (a^2/2)[t - (1/2)sin2t] + C
= (a^2/2)[t - sintcost] + C
= (a^2/2)[arcsin(x/a) - (1/a^2)x√(a^2-x^2)] + C
= (1/2)a^2 arcsin(x/a) - (x/2)√(a^2-x^2) + C
I = ∫ (asint)^2 acost dt / (acost) = a^2∫ (sint)^2 dt
= (a^2/2)∫ (1-cos2t) dt = (a^2/2)[t - (1/2)sin2t] + C
= (a^2/2)[t - sintcost] + C
= (a^2/2)[arcsin(x/a) - (1/a^2)x√(a^2-x^2)] + C
= (1/2)a^2 arcsin(x/a) - (x/2)√(a^2-x^2) + C
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