已知0〈α〈π/2,那么log(sinα)(1/(1-cos^2α))=? = =RT

问题描述:

已知0〈α〈π/2,那么log(sinα)(1/(1-cos^2α))=? = =RT

log(sinα)(1/(1-cos^2α))=log(sinα)(1/(sin^2α)=log(sinα)(sinα)^(-2)==-2