Find L4 for f(x)=49cos(pi/2) from [2pi/4,2pi/2] I thought it would just be zero since there aren't any x's in f(x)? Apparently that's incorrect though. Any help would be wonderful!
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Originally Posted by A5HLEY Find L4 for f(x)=49cos(pi/2) from [2pi/4,2pi/2] I thought it would just be zero since there aren't any x's in f(x)? Apparently that's incorrect though. Any help would be wonderful! Either you have a typo or you book has one becuase $\displaystyle f(x)=49\cos(\pi/2)=0 $ for all values of x. so the left endpoint sum would be $\displaystyle L_4=\sum_{i=0}^{3}f(\frac{\pi}{2}+i\frac{\pi}{8})\ frac{\pi}{8}=0$ since f(x)=0 for all values of x.
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