Find the derivative of the function using the quotient rule Find the instantaneous rate of change of the tangent line at the point pi/2 by plugging in x=pi/2 and solving for dy/dx Write the general equation for a line Solve for y_1 by plugging in x=pi/2. # (cosx+sinx) (1/cosx+1/sinx)# we can now expand this to get Of #t, and, t of x.#
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