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14.1: Una breve tabla de integrales
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\(\int\cos\omega _{1}u\cos\omega _{2}u\:du =\frac{\sin (\omega _{1}+\omega _{2})u}{2(\omega _{1}+\omega _{2})}+\frac{\sin (\omega _{1}-\omega _{2})u}{2(\omega _{1}-\omega _{2})}+c\quad (\omega _{1}\ne... $\int\cos\omega _{1}u\cos\omega _{2}u\:du =\frac{\sin (\omega _{1}+\omega _{2})u}{2(\omega _{1}+\omega _{2})}+\frac{\sin (\omega _{1}-\omega _{2})u}{2(\omega _{1}-\omega _{2})}+c\quad (\omega _{1}\neq\pm\omega _{2})$ $\int\sin\omega _{1}u\sin\omega _{2}u\:du =-\frac{\sin (\omega _{1}+\omega _{2})u}{2(\omega _{1}+\omega _{2})}+\frac{\sin (\omega _{1}-\omega _{2})u}{2(\omega _{1}-\omega _{2})}+c\quad (\omega _{1}\neq\pm\omega _{2})$

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