展开 (pij)/(z(z-pi-pij)(z+pi+pij))

解答

展开

\frac{πj}{z ( z - π - πj ) ( z + π + πj )}

\frac{πj}{z ^{3} - π ^{2} z - 2 π ^{2} j z - π ^{2} j ^{2} z}

求解步骤

\frac{πj}{z ( z - π - πj ) ( z + π + πj )}

乘开

z (z - π - πj) (z + π + πj) : z^{3} - π^{2} z - 2 π^{2} j z - π^{2} j^{2} z

= \frac{πj}{z ^{3} - π ^{2} z - 2 π ^{2} j z - π ^{2} j ^{2} z}

s im pl i f y cos (x) \cdot (1 + \frac{tan ^{2} ( x )}{sec ( x ) + 1})

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e x p an d (sin (x) + tan (x)) (cos (x) - cot (x))

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e x p an d \frac{( x - 1 ) ( x + 2 )}{( x - 3 ) ( x + 7 )}