Question

if a and b are acute angles such that cos A = cos B prove that A and B are equal, using the trigonometric ratios for all specific angles(0,30,45,60,90)​

Answer 1

$\huge {\bold {\red {s0lUtion}}}$

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$Let \: ABC\: be \:a \: right \\ \: angled \:triangle \: at \: C$

$Cos \: A = Cos \: B$

$\frac{BC}{AB} = \frac{AC}{AB}$

$BC = AC$

$or$

$angle \: A = angle \: B$

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$\huge {\bold {\red {Hope \:it \:helps}}}$