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Prove the following identity: `sec^4theta-sec^2theta=tan^4theta+tan^2theta`

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L.H.S. `=tan^(4)theta+tan^(2)theta=tan^(2)theta(tan^(2)theta+1)`
`=(sec^(2)theta-1)sec^(2)theta=sec^(4)theta-sec^(2)theta=R.H.S.`

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