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Yair Young
Mathematics
18 November, 21:04
What is the cofunction of cos 2pi / 9
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Avah Mclaughlin
18 November, 21:30
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The cofunction of cos is sin (90-x)
90 degrees is equal to PI/2
The cofunction becomes sin (PI/2 - 2PI/9)
Rewrite both fractions to have a common denominator:
PI/2 = 9PI/18
2PI/9 = 4PI/18
Now you have sin (9PI/18 - 4PI/18)
Simplify:
Sin (5PI/18)
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