# The derivative of sin x IS NOT cos x if 'x' is in degrees?

In order to prove the derivative of sin x, we need to know the limit of sin h / h, as h approaches 0.

In order to prove the limit, h must be in radians (as a requirement on the proof)

How can such identities that originally rely on radians be generalized to the same identity in degrees?

In order to prove the limit, h must be in radians (as a requirement on the proof)

How can such identities that originally rely on radians be generalized to the same identity in degrees?

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