Math, asked by aichi909, 2 months ago

IF LA and LB are Acute angles such
That COSA = COB thon Show That LA=LB

Answers

Answered by arpithmenon2018
5

According to the question:-

Let cosA=  

Hypotenuse

sideadjacentA

​  

 

AB

AC

​  

 

Similarly,

cosB=  

Hypotenuse

sideadjacentB

​  

 

=  

AB

BC

​  

 

Given that

cosA=cosB

AB

AC

​  

=  

AB

BC

​  

 

AC=BC

In triangle,

angles opposite equal side are equal  

∠B=∠A

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