Arthur D. answered 09/30/18
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cosxtanx/cosecx^2=cosx^3/cotx^3
(cosx)(sinx/cosx)/(1/sinx^2)=cosx^3/(cosx^3/sinx^3)
(sinx)/(1/sinx^2)=(cosx^3sinx^3/cosx^3)
sinx^3=sinx^3