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Grade: 11

                        

if 2tanA=3tanB,prove that tan(A-B)=sin2B/5-cos2B

5 years ago

Answers : (2)

Latika Leekha
askIITians Faculty
165 Points
							Hello student,
Given that 2 tan A = 3 tan B,
So, tan A = 3/2 tan B ….. (i)
242-1991_forum jun 2.png
5 years ago
Rishi Sharma
askIITians Faculty
614 Points
							Dear Student,
Please find below the solution to your problem.

If 2tanA=3tanB or tanA=(3/2).tanB
Prove that tan(A-B)=sin2B/(5-cos2B)
LHS.
tan(A-B)=(tanA-tanB)/(1+tanA.tanB), put tanA=(3/2).tanB.
=[(3/2)tanB-tanB]/[1+(3/2)tan^2B]
=[(1/2).tanB]/[(2cos^2B+3sin^2B)/2cos^2B].
=[(sinB/2cosB)×2cos^2B]/[2cos^2B+3sin^2B].
=[sinBcosB]/(2cos^2B+3sin^2B)
=(sin2B)/2.(2cos^2B+3sin^2B
=(sin2B)/(4cos^2B+6sin^2B)
=(sin2B)/[4(1-sin^2B)+6sin^2B]
=(sin2B)/[4–4sin^2B+6sin^2B]
=(sin2B)/[4+2sin^2B) , put 2sin^2B=1-cos2B
=(sin2B)/[4+1-cos2B]
=(sin2B)/(5-cos2B) , Proved.

Thanks and Regards
3 months ago
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