展开-2/((x+1)(x-1))

解答

展开

- \frac{2}{( x + 1 ) ( x - 1 )}

- \frac{2}{x ^{2} - 1}

求解步骤

- \frac{2}{( x + 1 ) ( x - 1 )}

乘开

(x + 1) (x - 1) : x^{2} - 1

= - \frac{2}{x ^{2} - 1}

e x p an d \frac{( 2 )}{( x ^{2} - 1 )} - \frac{( 2 )}{x + 2}

e x p an d \frac{( ( n ^{2} x ^{2} - 2 ) sin ( n x ) + 2 n x cos ( n x ) )}{n ^{3}}

s im pl i f y \frac{- 5 z ^{2} - 10 i z + 6}{( z + i ) ^{3}} + 8

e x p an d 80 (e^{- t} - e^{- 2 t})

e x p an d (5 + t + 5 - 5 t, (5 + t)^{2}) \cdot (1, - 1)