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Solution 4.2:5d

From Förberedande kurs i matematik 1

Revision as of 08:16, 29 September 2008 by Ian (Talk | contribs)
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By subtracting 360 from 495, we do not change the value of the tangent:


tan495=tan495−360=tan135 

We know from exercise a that cos135=−12 and sin135=12, which gives


tan135=sin135cos135=12−12=−1

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