If the sides and angles of a plane triangle vary in such a way that its circumradius remains constant then that `(da)/cosA+(db)/cosB+(dc)/cosC=`

If a triangle ABC inscribed in a fixed circle be slightly varied in such a way that its vertices are always on the circle, show that, (da)/(cosA) + (db)/(cosB) + (dc)/(cosC)= 0 .

If a triangle ABC inscribed in a fixed circle be slightly varies in such a way as to have its varies aways on the circle, then show that (da)/(cosA)+(db)/(cos B)+(dc)/(cos c)= 0

In Delta ABC , the side c and angle C are constant. If there are small changes in the remaining sides and angles, then show that (da)/(cos A) +(db)/(cos B)= 0 .

ABC is a trangle whose sides are a units, b units and c units respectively and their corresponding opposite angles are A,B and C. If in the triangle ABC, the side c and angle C remain unchanged while the other sides and angles are changed slightly then the value of (da)/(cosA) + (db)/(cosB) is -

If in the triangle ABC, the side c and the angle C remain unchnged while the other sides and angles are changed slightly, show that, (da)/(cosA) + (db)/(cosB) = 0

If in a triangle ABC, the side c and the angle C remain constant while the remaining elements are changed slightly, show that (da)/(cosA)+(db)/(cosB)=0

If in a triangle A B C , the side c and the angle C remain constant, while the remaining elements are changed slightly, show that (d a)/(cosA)+(d b)/(cosB)=0.

If in a triangle A B C , the side c and the angle C remain constant, while the remaining elements are changed slightly, show that (d a)/(cosA)+(d b)/(cosB)=0.

If in a triangle ABC, the side c and the angle C remain constant,while the remaining elements are changed slightly,show that (da)/(cos A)+(db)/(cos B)=0

If in a triangle ABC, the side c and the angle C remain constant,while the remaining elements are changed slightly,using differentials show that (da)/(csA)+(db)/(cos B)=0