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You need to remember the following trigonometric identity such that:

`1 + tan^2 x = 1/(cos^2 x)`

Hence, substituting `1/(cos^2 x)`  for `1 + tan^2 x`  yields:

`1/(cos^2 x) = sec^2 x`

Since the definition of secant function is the following `sec x = 1/cos x` , hence, `sec^2...

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