If ∠ A and ∠ B are acute angles such that cos A = cos B, then show that ∠ A = ∠ B ?

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If ∠ A and ∠ B are acute angles such that cos A = cos B, then show that ∠ A = ∠ B ?


Solution:

⇨ For acute angle 
⇨ cos A = A
⇨ cos B = B
⇨ Now
⇨ cos A = cos B
⇨ A = B

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