Banner 0
Banner 1
Banner 2
Banner 3
Banner 4
Banner 5
Banner 6

Q.

In aABC,a3 cos(B-C)=

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away
An Intiative by Sri Chaitanya

a

1

b

0

c

3abc

d

abc

answer is C.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

detailed_solution_thumbnail

G.E=8R3sin3 Acos(B-C)=8R3sin2 Asin(B+C)cos(B-C) =4R2sin2 Asin 2B+sin 2C =8R3sin2 Asin B cos B+sin2 Asin C cosC+sin2 B sin C cos C+sin2 B sin A cos A+sin2 C sin A cos A+sin2 C sin B cos B =8R3sin A sin B(sin A cos B+cos A sin B)+sin B sin C(sin B cos C+cos B sin C)+sin C sin A(sin A cos C+cos A sin C) =8R3sin A sin B sin (sin A+B)+sin B sin C sin (sin B+C)+sin C sin A sin (C+A) =8R23 sin A sin B sin C=3abc

Watch 3-min video & get full concept clarity

Best Courses for You

JEE

JEE

NEET

NEET

Foundation JEE

Foundation JEE

Foundation NEET

Foundation NEET

CBSE

CBSE

score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon
In aABC,∑a3 cos(B-C)=