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(cos(4x)-cos(8x))/(cos(4x)+cos(8x))=tan(2x)tan(6x)
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(cos(4x)-cos(8x))/(cos(4x)+cos(8x))=tan(2x)tan(6x)

User Hearaman
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Hello here is a solution : 
(cos(4x)-cos(8x))/(cos(4x)+cos(8x))=tan(2x)tan(6x)-example-1
User Jnbdz
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