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OpenStudy (crashonce):
In the figure, what is cos A
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OpenStudy (crashonce):
|dw:1419850611587:dw|
OpenStudy (crashonce):
A is the whole angle (180 degree plus something)
OpenStudy (anonymous):
that something u dont need to find:P
OpenStudy (michele_laino):
using the defintion of cosine function, we have: \[\cos A=-\frac{ 4 }{ 5 }\]
OpenStudy (anonymous):
|dw:1419850719409:dw|
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