3个回答
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(1)
(1+x)/(1-x)=t
1+x=t-tx
x+tx=t-1
x(t+1)=t-1
x=(t-1)/(t+1)
(2)
x=(t-1)/(t+1)带入(1-x²)/(1+x²)
(1-x²)/(1+x²)
={1-[(t-1)/(t+1)]²/{1+[(t-1)/(t+1)]²]
=[(t²+2t+1-t²+2t-1)/(t+1)²]/[(t²+2t+1+t²-2t+1)/(t+1)²]
=4t/(2t²+2)
=2t/(t²+1)
(1+x)/(1-x)=t
1+x=t-tx
x+tx=t-1
x(t+1)=t-1
x=(t-1)/(t+1)
(2)
x=(t-1)/(t+1)带入(1-x²)/(1+x²)
(1-x²)/(1+x²)
={1-[(t-1)/(t+1)]²/{1+[(t-1)/(t+1)]²]
=[(t²+2t+1-t²+2t-1)/(t+1)²]/[(t²+2t+1+t²-2t+1)/(t+1)²]
=4t/(2t²+2)
=2t/(t²+1)
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