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Find the linearization L(x) of the function at a = 7π/2 f(x)=cos(x)

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We need a point and a slope to find a linearization. All you are really finding is a y=mx+b First find m Take the derivative of cos x sub in 7pi/2 This value will be the slope for your line Now we need a point We know x = 7pi/2 Use f(x)=cos(x) to find y = f(7pi/2) Then I like to use the point-slope form of the equation of a line \[y-y _{1} =m \left( x-x _{1} \right) \] Solve for y
can you show me steps by steps please?

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derivative of cos(x) = -sin(x) -sin(7pi/2) = -sin(pi/2) = -(-1) now for the point (7pi/2, ? ) cos(7pi/2) = 0 Then it is just like what nikvist posted. OK?

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