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Solution 4.2:4c

From Förberedande kurs i matematik 1

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m (Lösning 4.2:4c moved to Solution 4.2:4c: Robot: moved page)
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In exercise e, we studied the angle
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<center> [[Image:4_2_4c.gif]] </center>
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<math>\frac{3\pi }{4}</math>
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and found that
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<math>\cos \frac{3\pi }{4}=-\frac{1}{\sqrt{2}}</math>
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and
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<math>\sin \frac{3\pi }{4}=\frac{1}{\sqrt{2}}</math>
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Because
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<math>\text{tan }x</math>
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is defined as
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<math>\frac{\sin x}{\cos x}</math>, we get immediately that
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<math>\tan \frac{3\pi }{4}=\frac{\sin \frac{3\pi }{4}}{\cos \frac{3\pi }{4}}=\frac{\frac{1}{\sqrt{2}}}{-\frac{1}{\sqrt{2}}}=-1</math>

Revision as of 13:11, 28 September 2008

In exercise e, we studied the angle 43 and found that

cos43=−12 and sin43=12


Because tan x is defined as sinxcosx, we get immediately that


tan43=sin43cos43=12−12=−1

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