# User:Raul654/proof

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Proof that 0 = -1

I stumbled across this in my high school Calculus BC class. Here's a challenge for my fellow math geeks - what is wrong here?

Given:

Let

- Therefore,

Let

- Therefore,

- Substitute from above.

- Sec(x) * cos(x) = 1

- Group the minus signs.

- (Subtract the integral from each side)

- Voilà - a logical inconsistency.