Back propagation in RNN

Course Q&A Deep Learning Specialization Sequence Models
1

My question is very basic. I don’t understand what dtanh is and how is it being computed?

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2

It is the derivative of the tanh activation function.

3

How is it being computed? Also how is partial derivative of tanh(x) equal to 1-(tanh(x))^2?

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5

Thank you! You are a blessing upon us.

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