Equation of the tangent to a curve

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Homework Statement



y = secx
find the equation of the tangent to the curve at x = -9pi/4 and -7pi/4


Homework Equations



the derivative is secxtanx. do I just subsitute in the values -9pi/4 and then -7pi/4 to get the answer to the slope then what?


The Attempt at a Solution

 
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If you know the slope of the line, you can find the intercept once you know at least one point on that line.
 

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