Home
Class 12
MATHS
In any DeltaABC, 2 [bc cos A + ca cos B+...

In any `DeltaABC, 2 [bc cos A + ca cos B+ ab cos C]=`

A

`a^(2)+ b ^(2)+ c ^(2)`

B

`a ^(2) + b ^(2)-c^(2)`

C

`a ^(2)-b^(2)+c^(2)`

D

`a ^(2) -b^(2)+ c ^(2)`

Text Solution

Verified by Experts

Promotional Banner

Similar Questions

Explore conceptually related problems

In a Delta ABC, c cos ^(2)""(A)/(2) + a cos ^(2) ""(C ) /(2)=(3b)/(2), then a,b,c are in

In a DeltaABC,3 sin A+4 cos B=6 and 3 cos A+4 sinB=1 , then angleC can be

In a triangle ABC, cos 3A + cos 3B + cos 3C = 1 , then then one angle must be exactly equal to

In DeltaABC,if cos A+ sin A -(2)/(cos B + sin B) =0, then (a+b)/c is equal to

If in DeltaABC, angle A=90^(@) and c, sin B cos B are rational numbers, then show a and b are rational .

In a triangle ABC, sin A- cos B = Cos C , then angle B is

In DeltaABC the mid points of the sides AB, BC and CA are (l, 0, 0), (0, m, 0) and (0, 0,n) respectively. Then, (AB^2+BC^2+CA^2)/(l^2+m^2+n^2) is equal to

In DeltaABC , right angled at B, AB = 24 cm, BC = 7 cm . Determine : sin C, cos C .

In DeltaABC , right angled at B, AB = 24 cm, BC = 7 cm . Determine : sin A, cos A .

Answer the following by a number or a word or a sentence : In DeltaABC, AB= 11 cm, BC= 60 cm and CA = 61 cm. State the type of DeltaABC .