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# If $f(t) =$ sec $t,$ find $f"(\pi/4).$

Derivatives

Differentiation

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##### Catherine R.

Missouri State University

##### Kristen K.

University of Michigan - Ann Arbor

##### Michael J.

Idaho State University

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### Video Transcript

Hey, it's clear. So when you read here So we're gonna take the derivative of speaking. We got seek It turns tangent we're gonna drive that a second time using the product rule and yet seek it. Do you ever DT for tone Jim plus 10 gin Do you over DT seton Is this equal to seek it? Times seeking square plus 10 gin. I'm seeking time. Tension. So when we plug in pie over four, we get three square root too.