when I enter quaduexpucos14u2sinu205 I get 04064 which is tw

when I enter quad(@(u)exp(-(u+cos(14*u)).^2).*sin(u).^2,0,5) I get 0.4064 which is twice what I believe the answer should be (0.2559)

Solution

quad(@(u)exp(-(u+cos(14*u)).^2).*sin(u).^2,0,5)

your syntax is totally correct and your answer is also correct

Correct answer is = 0.4064

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I checked with Integral calculator (walfram alpha)