(2cos²α-1)/(1-2sin²α)+cotαtanα求值
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(2cos²α-1)/(1-2sin²α)+cotαtanα求值
(2cos²α-1)/(1-2sin²α)+cotαtanα
求值
(2cos²α-1)/(1-2sin²α)+cotαtanα求值
=cos(2α)/sin(2α)+1=cot(2α)+1
(2cos²α-1)/(1-2sin²α)+cotαtanα求值
(2cos²α-1)/(1-2sin²α)+cotαtanα
求值
(2cos²α-1)/(1-2sin²α)+cotαtanα求值
=cos(2α)/sin(2α)+1=cot(2α)+1