(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

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.