Related InterviewSolutions

• If `A+B+C=pi`, prove that : `sin (B+C-A) + sin (C+A-B) + sin (A+B-C)=4sinA sinB sinC`
• If `A+B+C=pi`, prove that : `cos2A+cos2B-cos2C=1-4sinA sinB cosC`
• If `A+B+C=pi`, prove that : `tan A/2 tan B/2 + tan B/2 tan C/2 + tan C/2 tan A/2 =1`
• If `A+B+C=pi` then prove that `cos^2 (A/2)+cos^2 (B/2)-cos^2 (C/2)=2cos(A/2)cos(B/2)sin(C/2)`
• If `A+B+C=pi `, prove that `cos 2A +cos 2B +cos 2C=-1-4cos A cos Bcos C.`