Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
a2+b2c2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
c2a2−b2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
c2a2+b2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is Aa2−b2c2 sin(A−B)sin(A+B=sinAcosB−sinBcosAsinC =accosB−bccosA But cos B=a2+c2−b22ac,cosA=b2+c2−a22bc ⇒accosB−bccosA=12c2 (a2+c2−b2−b2−c2+a2)=a2−b2c2