Evaluate
2\left(a+1\right)
Expand
2a+2
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\frac{\frac{a+2}{a-1}\times \frac{2a\left(a-2\right)}{\left(a-2\right)\left(a+2\right)}}{\frac{a}{a^{2}-1}}
Factor the expressions that are not already factored in \frac{2a^{2}-4a}{a^{2}-4}.
\frac{\frac{a+2}{a-1}\times \frac{2a}{a+2}}{\frac{a}{a^{2}-1}}
Cancel out a-2 in both numerator and denominator.
\frac{\frac{\left(a+2\right)\times 2a}{\left(a-1\right)\left(a+2\right)}}{\frac{a}{a^{2}-1}}
Multiply \frac{a+2}{a-1} times \frac{2a}{a+2} by multiplying numerator times numerator and denominator times denominator.
\frac{\frac{2a}{a-1}}{\frac{a}{a^{2}-1}}
Cancel out a+2 in both numerator and denominator.
\frac{2a\left(a^{2}-1\right)}{\left(a-1\right)a}
Divide \frac{2a}{a-1} by \frac{a}{a^{2}-1} by multiplying \frac{2a}{a-1} by the reciprocal of \frac{a}{a^{2}-1}.
\frac{2\left(a^{2}-1\right)}{a-1}
Cancel out a in both numerator and denominator.
\frac{2\left(a-1\right)\left(a+1\right)}{a-1}
Factor the expressions that are not already factored.
2\left(a+1\right)
Cancel out a-1 in both numerator and denominator.
2a+2
Expand the expression.
\frac{\frac{a+2}{a-1}\times \frac{2a\left(a-2\right)}{\left(a-2\right)\left(a+2\right)}}{\frac{a}{a^{2}-1}}
Factor the expressions that are not already factored in \frac{2a^{2}-4a}{a^{2}-4}.
\frac{\frac{a+2}{a-1}\times \frac{2a}{a+2}}{\frac{a}{a^{2}-1}}
Cancel out a-2 in both numerator and denominator.
\frac{\frac{\left(a+2\right)\times 2a}{\left(a-1\right)\left(a+2\right)}}{\frac{a}{a^{2}-1}}
Multiply \frac{a+2}{a-1} times \frac{2a}{a+2} by multiplying numerator times numerator and denominator times denominator.
\frac{\frac{2a}{a-1}}{\frac{a}{a^{2}-1}}
Cancel out a+2 in both numerator and denominator.
\frac{2a\left(a^{2}-1\right)}{\left(a-1\right)a}
Divide \frac{2a}{a-1} by \frac{a}{a^{2}-1} by multiplying \frac{2a}{a-1} by the reciprocal of \frac{a}{a^{2}-1}.
\frac{2\left(a^{2}-1\right)}{a-1}
Cancel out a in both numerator and denominator.
\frac{2\left(a-1\right)\left(a+1\right)}{a-1}
Factor the expressions that are not already factored.
2\left(a+1\right)
Cancel out a-1 in both numerator and denominator.
2a+2
Expand the expression.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}