In `DeltaABC, a=4, b=6, c=8`, then find the value of `8 cos A + 16 cos B + 4 cos C`.

In DeltaABC , a=7, b=5 and c=8, then find the value of cos2B.

In Delta ABC, if cot A+cot B+cot C=0 then find the value of cos A cos B cos C.

In o+ABC, if cot A+cot B+cot C=0 then find the value of cos A cos B cos C

Find the maximum value of 5 tan 8 cos 8 + 4 cos 8.

Let A,B,C be the three angles such that A+B+C=pi , tan A.tan B=2 , then find the value of (cos A cos B)/(cos C)

In DeltaABC , if a=6, b=8, c=10, evaluate cos2A.

If in a triangle ABC right angled at B, AB = 6 units and BC = 8 units, then find the value of sin A. cos C + cos A. sin C.

If DeltaABC is right angled at C , then the value of cos(A+B) is

In any DeltaABC , a cos A +b cos B + c cos C =