My Math Forum Evaluating Expressions

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November 5th, 2014, 04:41 PM   #1
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Evaluating Expressions

Hi everyone,

I really need some help evaluating the following expressions. Any help you could offer would be great Also if you could show your steps, so I can learn how to do the problems, that would also be appreciated. Thanks to everyone who helps out.
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 November 5th, 2014, 06:43 PM #2 Global Moderator   Joined: Dec 2006 Posts: 19,739 Thanks: 1810 (a). Use the rules that for positive $x$ and $y$ and any logarithmic base, $$\log(x) + \log(y) = \log(xy)\,\text{ and }\log(x^3) = 3\log(x).$$ (b). Multiply the numerator and denominator by 3^16. Multiplying powers of the same integer is done by adding the exponents. Is that sufficient help? Thanks from topsquark and aurel5
 November 6th, 2014, 04:43 AM #3 Senior Member     Joined: Nov 2010 From: Indonesia Posts: 2,000 Thanks: 132 Math Focus: Trigonometry Also, for log 0.001, just do the mental math: 10 to the power of what will result in 0.001?

### evaluate the expression cos(7/4 pi)

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