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Find an integrating factor to solve the first-order linear differential equation 1 dy cos x da + y = cos a, x + nn,

Find an integrating factor to solve the first-order linear differential equation 1 dy cos x da + y = cos a, x + nn, n [13 marks] For the integral you need to evaluate you may want to write cos r as the product of cos2 r and cos r as part of the integrand.

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