InterviewSolution
`8SEC^(2)8x+6sec^(2)6x+sec^(2)2X``sec^(2)8x+6sec^(2)6x+sec^(2)2x``8sec^(2)8x-sec6sec^(2)6x-2sec^(2)2x``sec^(2)8x-sec^(2)6x-sec^(2)2x`
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