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, using differentials show that (d a)/(c sA)+(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, using differentials show that (d a)/(c sA)+(d b)/(cosB)=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

If a triangle ABC, inscribed in a fixed circle, be slightly varied in such away as to have its vertices always on the circle, then show that (d a)/(c a sA)+(d b)/(cosB)+(d c)/(cosC)=0.

If a triangle ABC, inscribed in a fixed circle, be slightly varied in such away as to have its vertices always on the circle, then show that (d a)/(c a sA)+(d b)/(cosB)+(d c)/(cosC)=0.

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

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

(a+b+c)(cosA+cosB+cosC)

If in a triangle A B C , (2cosA)/a+(cos B)/b+(2cosC)/c=a/(b c)+b/(c a) , then prove that the triangle is right angled.