⭐Resultado de la integral definida : 3.
14 = πAntes de resolver, reescribiremos la función, empleando diferentes propiedades : cos (x - π / 2) = cosx · cos(π / 2) + senx · sen(π / 2) = cosx + 0.
027senxEntonces : <img src="https://tex.z-dn.net/?f=%5Cint%5Climits%5E%5Cfrac%7B%5Cpi%7D%7B4%7D_%5Cfrac%7B-%5Cpi%7D%7B4%7D%20%7B%5Cfrac%7B%28cosx%2B0.027senx%29%5E%7B2%7D%7D%7Bcosx%5E%7B2%7D%7D%20%7D%5C%2C%20dx%2B%5Cint%5Climits%5E%5Cfrac%7B%5Cpi%7D%7B4%7D_%5Cfrac%7B-%5Cpi%7D%7B4%7D%20%7B1%7D%5C%2C%20dx" />Aparte<img src="https://tex.z-dn.net/?f=%5Cint%5C%20%281%29%5C%2C%20dx%20%3Dx%2Bc" /><img src="https://tex.z-dn.net/?f=%5Cint%5Climits%5E%5Cfrac%7B%5Cpi%7D%7B4%7D_%5Cfrac%7B-%5Cpi%7D%7B4%7D%201%5C%2C%20dx%20%3D%5Cfrac%7B%5Cpi%7D%7B4%7D%2B%5Cfrac%7B%5Cpi%7D%7B4%7D%3D%5Cfrac%7B%5Cpi%7D%7B2%7D" />Seguimos : Aplicando producto notable<img src="https://tex.z-dn.net/?f=%5Cint%5Climits%5E%5Cfrac%7B%5Cpi%7D%7B4%7D_%5Cfrac%7B-%5Cpi%7D%7B4%7D%20%7B%5Cfrac%7Bcosx%5E%7B2%7D%2B0.054senx%2Acos%2B7.5%2A10%5E%7B-4%7Dsenx%5E%7B2%7D%7D%7Bcosx%5E%7B2%7D%7D%7D%5C%2C%20dx" /><img src="https://tex.z-dn.net/?f=%5Cint%5Climits%5E%5Cfrac%7B%5Cpi%7D%7B4%7D_%5Cfrac%7B-%5Cpi%7D%7B4%7D%201%2B0.054tanx%2B7.5%2A10%5E%7B-4%7Dtanx%5E%7B2%7D%7D%7D%5C%2C%20dx" /><img src="https://tex.z-dn.net/?f=%5Cint%5Climits%5E%5Cfrac%7B%5Cpi%7D%7B4%7D_%5Cfrac%7B-%5Cpi%7D%7B4%7D%201%2B0.054tanx%2B7.5%2A10%5E%7B-4%7Dtanx%5E%7B2%7D%7D%7D%5C%2C%20dx" />APARTE : <img src="https://tex.z-dn.net/?f=%5Cint%5C%20%28tanx%29%5C%2C%20dx%20%3Dln%7Csecx%7C%2Bc" /><img src="https://tex.z-dn.net/?f=%5Cint%5Climits%5E%5Cfrac%7B%5Cpi%7D%7B4%7D_%5Cfrac%7B-%5Cpi%7D%7B4%7D0.054tanx%7D%7D%5C%2C%20dx%3D0.054%2A%5Bln%7Csec%28%5Cpi%2F4%29%7C-ln%7Csec%28-%5Cpi%2F4%29%7C%5D%3D0.054%2A%289.4%2A10%5E%7B-5%7D-9.4%2A10%5E%7B-5%7D%29%3D0" />APARTE : <img src="https://tex.z-dn.net/?f=7.5%2A10%5E%7B-4%7D%5Cint%5C%20%28tanx%5E%7B2%7D%29%5C%2C%20dx%20%3D7.5%2A10%5E%7B-4%7D%5Cint%5C%20%28secx%5E%7B2%7D-1%29%5C%2C%20dx" /><img src="https://tex.z-dn.net/?f=7.5%2A10%5E%7B-4%7D%5Cint%5C%20%28secx%5E%7B2%7D-1%29%5C%2C%20dx%3D7.5%2A10%5E%7B-4%7D%28tanx-x%2Bc%29" />Evaluando en x, obtendremos π / 2, tal como se ha demostrado más arriba.
Finalmente evaluamos : [img = 10]⭐JUNTAMOS LOS RESULTADOSπ / 2 + 0 - 1.
2 × 10⁻³ + π / 2π / 2 + 1.
2 × 10⁻³ + π / 2 = 3.
14.