3.1.59 \(\int \frac {1}{(-2+x) \sqrt {2+x-x^2}} \, dx\) [59]

Optimal. Leaf size=21 \[ \frac {2 \sqrt {2+x-x^2}}{3 (-2+x)} \]

[Out]

2/3*(-x^2+x+2)^(1/2)/(-2+x)

________________________________________________________________________________________

Rubi [A]
time = 0.00, antiderivative size = 23, normalized size of antiderivative = 1.10, number of steps used = 1, number of rules used = 1, integrand size = 18, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.056, Rules used = {664} \begin {gather*} -\frac {2 \sqrt {-x^2+x+2}}{3 (2-x)} \end {gather*}

Antiderivative was successfully verified.

[In]

Int[1/((-2 + x)*Sqrt[2 + x - x^2]),x]

[Out]

(-2*Sqrt[2 + x - x^2])/(3*(2 - x))

Rule 664

Int[((d_.) + (e_.)*(x_))^(m_)*((a_.) + (b_.)*(x_) + (c_.)*(x_)^2)^(p_), x_Symbol] :> Simp[e*(d + e*x)^m*((a +
b*x + c*x^2)^(p + 1)/((p + 1)*(2*c*d - b*e))), x] /; FreeQ[{a, b, c, d, e, m, p}, x] && NeQ[b^2 - 4*a*c, 0] &&
EqQ[c*d^2 - b*d*e + a*e^2, 0] &&  !IntegerQ[p] && EqQ[m + 2*p + 2, 0]

Rubi steps

\begin {align*} \int \frac {1}{(-2+x) \sqrt {2+x-x^2}} \, dx &=-\frac {2 \sqrt {2+x-x^2}}{3 (2-x)}\\ \end {align*}

________________________________________________________________________________________

Mathematica [A]
time = 0.10, size = 21, normalized size = 1.00 \begin {gather*} \frac {2 \sqrt {2+x-x^2}}{3 (-2+x)} \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[1/((-2 + x)*Sqrt[2 + x - x^2]),x]

[Out]

(2*Sqrt[2 + x - x^2])/(3*(-2 + x))

________________________________________________________________________________________

Maple [A]
time = 0.09, size = 22, normalized size = 1.05

method	result	size
gosper	\(-\frac {2 \left (1+x \right )}{3 \sqrt {-x^{2}+x +2}}\)	\(16\)
risch	\(-\frac {2 \left (1+x \right )}{3 \sqrt {-x^{2}+x +2}}\)	\(16\)
trager	\(\frac {2 \sqrt {-x^{2}+x +2}}{3 \left (-2+x \right )}\)	\(18\)
default	\(\frac {2 \sqrt {-\left (-2+x \right )^{2}+6-3 x}}{3 \left (-2+x \right )}\)	\(22\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(-2+x)/(-x^2+x+2)^(1/2),x,method=_RETURNVERBOSE)

[Out]

2/3/(-2+x)*(-(-2+x)^2+6-3*x)^(1/2)

________________________________________________________________________________________

Maxima [A]
time = 3.86, size = 17, normalized size = 0.81 \begin {gather*} \frac {2 \, \sqrt {-x^{2} + x + 2}}{3 \, {\left (x - 2\right )}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(-2+x)/(-x^2+x+2)^(1/2),x, algorithm="maxima")

[Out]

2/3*sqrt(-x^2 + x + 2)/(x - 2)

________________________________________________________________________________________

Fricas [A]
time = 0.50, size = 17, normalized size = 0.81 \begin {gather*} \frac {2 \, \sqrt {-x^{2} + x + 2}}{3 \, {\left (x - 2\right )}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(-2+x)/(-x^2+x+2)^(1/2),x, algorithm="fricas")

[Out]

2/3*sqrt(-x^2 + x + 2)/(x - 2)

________________________________________________________________________________________

Sympy [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \int \frac {1}{\sqrt {- \left (x - 2\right ) \left (x + 1\right )} \left (x - 2\right )}\, dx \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(-2+x)/(-x**2+x+2)**(1/2),x)

[Out]

Integral(1/(sqrt(-(x - 2)*(x + 1))*(x - 2)), x)

________________________________________________________________________________________

Giac [A]
time = 0.92, size = 28, normalized size = 1.33 \begin {gather*} -\frac {4}{3 \, {\left (\frac {2 \, \sqrt {-x^{2} + x + 2} - 3}{2 \, x - 1} + 1\right )}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(-2+x)/(-x^2+x+2)^(1/2),x, algorithm="giac")

[Out]

-4/3/((2*sqrt(-x^2 + x + 2) - 3)/(2*x - 1) + 1)

________________________________________________________________________________________

Mupad [B]
time = 0.22, size = 19, normalized size = 0.90 \begin {gather*} \frac {2\,\sqrt {-x^2+x+2}}{3\,\left (x-2\right )} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/((x - 2)*(x - x^2 + 2)^(1/2)),x)

[Out]

(2*(x - x^2 + 2)^(1/2))/(3*(x - 2))

________________________________________________________________________________________