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Hitunglah: cos (2 pi)/(9) cos pi/36 - sin (2 pi)/(9) sin pi/36

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Hitunglah: cos (2 pi)/(9) cos pi/36 - sin (2 pi)/(9) sin pi/36

Hitunglah: cos (2 pi)/(9) cos pi/36 - sin (2 pi)/(9) sin pi/36

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The value of (1 + sin(2pi\/9)+cos(2pi\/9))….
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