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Grade: 11

                        

If tan B = mSinACosA/ 1-mSin^2A , prove that tan(A-B)=(1-m)tanA

2 years ago

Answers : (1)

Ravneet
104 Points
							
ANALYSE THE QUESTIONtan B = mSinACosA/ 1-mSin^2A 
we have to find tan(A-B) which is equal to(tanA – tanB )/(1+tanAtanB) ------------(1)
IN THIS QUESTION, JUST PUT THE VALUE OF tanB in upper equation (1)
after solving, you will get
 [tanA(1-msin2A) – msinAcosA ] / [1- msin2A + tanAmsinAcosA ]
JUST LOOK AT THE DENOMINATOR, IT IS BECOMING 1 (write tanA = sinA/cosA AND msin2A term will be cancelled )
NOW YOU ARE LEFT WITH NUMERATOR, 
mutiply and divide msinAcosA by cosA AND  take tanA common.
tanA [1-m(sin2A + cos2A )
tanA [ 1-m(1) ]
 
 
2 years ago
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