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if cos theta = c, then cos6theta= (...

if ` cos theta = c,` then `cos6theta=` (i) `32c^6-48c^4+18c^2-1` (ii) `32c^6+48c^4+18c^2-1` (iii) `32c^6-48c^4+18c^2+1` (iv) `32c^6-48c^4-18c^2-1`

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