(a) Find the tangent line approximation to cos(x) near x=\frac{\pi}{4} cos(x)=_______. (b) Is the tangent line approximation in part (a)an under-estimate or over-estimate for 0 <x < T/2 ? * Over-estimate because cos(x) is decreasing on the interval. * Under-estimate because cos(x) is concave down on the interval. * Over-estimate because cos(x) is concave down on the interval. * Under-estimate because cos(x) is decreasing on the interval.

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