class 12 maths integrals

$\int\limits_0^\pi {\left( {{{\sin }^2}\cfrac{x}{2} - {{\cos }^2}\cfrac{x}{2}} \right)dx}$

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📘 Integrals NCERT,ex.7.9,Q.18,Page 338 SA

$\int\limits_0^\pi {\left( {{{\sin }^2}\cfrac{x}{2} - {{\cos }^2}\cfrac{x}{2}} \right)dx}$

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: Let$\int\limits_0^\pi {\left( {{{\sin }^2}\cfrac{x}{2} - {{\cos }^2}\cfrac{x}{2}} \right)dx} = - \int\limits_0^\pi {\cos x} dx$

$= - \left[ {\sin x} \right]_0^\pi = - \left( {\sin \pi - \sin 0} \right) = - \left( {0 - 0} \right) = 0$

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