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" 9.Show that "cos A+cos B+cos C=1+(r)/(...

" 9.Show that "cos A+cos B+cos C=1+(r)/(R)

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In any Delta ABC, show that cos A+ cos B+ cos C = (1+ (r )/(R )).

In any Delta ABC, show that cos A+ cos B+ cos C = (1+ (r )/(R )).

In any Delta ABC, show that cos A+ cos B+ cos C = (1+ (r )/(R )).

Prove that cos A+cos B+cos C=1+(r)/(R)

Prove that cos A+cos B+cos C=1+(r)/(R)

In Delta ABC Prove that cos A + cos B+ cos C =1 + ( r ) / ( R )

In a Delta ABC, show that (a cos A+b cos B+ c cos C)/(a+b+c)= (r )/(R )

In a Delta ABC, show that (a cos A+b cos B+ c cos C)/(a+b+c)= (r )/(R )

In a Delta ABC, show that (a cos A+b cos B+ c cos C)/(a+b+c)= (r )/(R )

If A,B,C are the angles of a triangal ,prove that : cos A +cos B + cos C = 1+r/R