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,using differentials show that (da)/(csA)+(db)/(cos B)=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 .

If in a triangle ABC, (cosA)/a=(cosB)/b=(cosC)/c ,then the triangle is

If in a triangle A B C ,cosA+2cosB+cosC=2 prove that the sides of the triangle are in AP

In a Delta ABC if sides a and b remain constant such that a is the error in C, thenrelatinv error in its area, is

In a right triangle ABC, right angled at C, if /_B=60o and AB=15 units.Find the remaining angles and sides.

If the sides and angles of a plane triangle vary in such a way that its circumradius remains constant then that (da)/(cos A)+(db)/(cos B)+(dc)/(cos C)=

If A, B, C, D be the angles of acyclic quadrilateral, show that : cosA +cosB+cosC+cosD=0 .

In a triangle ABC, the side a,b,c are such that they are the roots of then (cosA)/a+(cosB)/b+(cosC)/c=