∫lntanx/cosxsinx dx

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∫lntanx/cosxsinxdx∫lntanx/cosxsinxdx∫lntanx/cosxsinxdx∫Intanx/sinx*cosxdx=∫Intanx*cosx/(cosx^2*sinx)

∫lntanx/cosxsinx dx
∫lntanx/cosxsinx dx

∫lntanx/cosxsinx dx
∫Intanx/sinx*cosxdx
=∫Intanx*cosx/(cosx^2*sinx)dx
=∫Intanx*cotxdtanx
=∫Intanx/tanxdtanx
=∫IntanxdIntanx
=1/2Intanx^2+C

∫ ln(tanx) / (sinx * cosx) dx
= ∫ ln(tanx) * 1/(sinx * cosx) dx
令u = ln(tanx),du = 1/(tanx) * sec²x = cosx/sinx * 1/cos²x = 1/(sinx * cosx) dx
原式= ∫ u du
= (1/2)u² + C
= (1/2)(lntanx)² + C