1- (sin^2x/1-cosx)=-cosx ?

Question: can someone please show me the steps to have this answer equal on both sides? 1- (sin^2x/1-cosx)=-cosx Best Answers: Answer by randomphailureUsing the identity sin^2(x)=1-cos^2(x), we get 1-((1-cos^2(x))/(1-cos(x))=-cos(x) => 1-(1+cos(x))=-cos(x) => -cos(x)=-cos(x) So this equation is true for all values of x except for those that make 1-cos(x)=0, which occurs when x=2kpi Answer by […] PR News Crimovies