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(D) (10 points) Ay 4. (a) (10 points) Consider the equation (cosr)y(x) - (sin x)y'(x) - (secr)y(x) = 0. The func- tion yi(x) = secr

(D) (10 points) Ay 4. (a) (10 points) Consider the equation (cosr)y"(x) - (sin x)y'(x) - (secr)y(x) = 0. The func- tion yi(x) = secr is a solution of this equation. Obtain a second, linearly independent solution yz of the equation for -

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