@ganeshie8 @Miracrown @dan815 @UsukiDoll

@ganeshie8 @Miracrown @dan815 @UsukiDoll

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\[\cot(\pi/15) - 4\sin(\pi/15) = \sqrt{15}\]

Similarly,\[4i \sin(16\pi/15) = 2(x^4 - x^{11})\]

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