化简 (1-2sin@cos@)/(cos@^2-sin@^2)*(1+2sin@cos@)/(1-2sin@^2) 两分式相乘

问题描述:

化简 (1-2sin@cos@)/(cos@^2-sin@^2)*(1+2sin@cos@)/(1-2sin@^2) 两分式相乘

(sin@-cos@)^2/(cos@-sin@)(cos@+sin@)*(sin@+cos@)^2/(cos@-sin@)(cos@+sin@)
=1