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OpenStudy (anonymous):
arcos (cos 3pi/4) and sin (arcsin -( root of 3)/2). Find without using calculator or a table.
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OpenStudy (anonymous):
You take the thing in the middle (cos 3 pi/4) And you say let that thing be theta. Let theta = cos 3pi/4. From that you make a right hand triangle of which theta is the star. You can gleen info about arcos from that triangle.
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