49 What is value of cot15^° ?

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(1 - cot 5^{\circ}) (1 - cot 10^{\circ}) (1 - cot 15^{\circ}) \dots (1 - cot 40^{\circ}) = 2^{k}

k

\frac{4^{8} - 4^{9}}{4^{8}}

(51)^{2} - (49)^{2}

What is absolute value?

-13 +(-69)+57-(-89)-(53+(-49) ?

56.5

$91$	$49$	$83$	$49$	$76$
$9$	$76$	$x$	$23$	$63$

x

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