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OpenStudy (anonymous):
find the equation of the line tangent to the graph of y=3x-cosx at x=0.
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OpenStudy (rogue):
\[y = 3x - \cos x, y(0) = -1\]\[y' = 3 + \sin x, y'(0) = 3 + sin (0) = 3\]\[Y_{tangent} = 3x - 1\]
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