Question

若(1+sinx)/cosx =m（m≠0）,则cosx/（sinx-1）的值为?

Answer 1

(1+sinx)/cosx=m (1 +sinx)(1+sinx)/(cos x*cosx)=m" [cosx*cosx=(1+sinx)(1-sinx)] (1+sinx)/(1-sinx)=m" (1+sinx)(1-sinx)/(1-sin x)(1-sinx)=m" cosx"/(1-sinx)=m" cosx/(1-sinx)=+_m 根据题意的其解为-m