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1.a) Use the formal definition of the derivative to compute f'(2) when
$f(x)=(1-x)/2x$
1.b) Do the same to find f'(x)

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The website was created in September 2005.

It is visited by 14,000 - 28,000 people daily, mostly from USA, Bulgaria, Russia, India, Philippines, Ukraine, Serbia...

In 2011 was created a Russian version, and in 2015 Serbian.

It is visited by 14,000 - 28,000 people daily, mostly from USA, Bulgaria, Russia, India, Philippines, Ukraine, Serbia...

In 2011 was created a Russian version, and in 2015 Serbian.