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[" If "alpha" and "beta" are the solutions of the equation "],[a cos theta+b sin theta=C," then show that "],[" (i) "cos(alpha+beta)=(a^(2)-b^(2))/(a^(2)+b^(2))],[" (ii) "cos(alpha-beta)=(2c^(2)-(a^(2)+b^(2)))/(a^(2)+b^(2))]

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