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 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

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 -

In any triangle ABC show that sinA+sinB gt sin C

In the triangle ABC, if the sides a,b reamain constant but the base angles A and B very, then show that, (dA)/(sqrt(a^(2) - b^(2) sin^(2)A)) = (dB)/(sqrt(b^(2) - a^(2) sin^(2)B)).

In a triangle ABC if the sides a, b be constant and the base angles A and B vary, then show that , (dA)/sqrt(a^2-b^2sin^2A) =(dB)/sqrt(b^2-a^2 sin^2B)

If in a triangle ABC, a=3, b=5 and c=7, show that the triangle is obtuse angled.

In any triangle ABC, show that (a sin C)/(b - a cosC)= tanA .

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