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What is the cos and sin of (13pi/3)? Also what is the reference angle in radians?

 Feb 22, 2021
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There are 2pi radians in a revolution.  Each time you do a whole revolution the sine value starts again.

 

sin(2pi + x) is the same as sinx

sin (4pi + x) is also the same as sinx

 

so sin    (13pi/3)  is the same as sin?

 

Answer this first.

 Feb 22, 2021

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