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Maths-

General

Easy

Question

In △ABC, if a=3 cm, b=4 cm, c=5 cm, then cos $straight C over 2$ =

$\frac{1}{\sqrt{5}}$
$\frac{1}{\sqrt{2}}$
$\sqrt{\frac{32}{35}}$
$\frac{2}{3}$

The correct answer is: $fraction numerator 1 over denominator square root of 2 end fraction$

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