A rotation of angle θ with 0º<θ<90º is applied in the Cartesian coordinate system xOy so that the line given by the equation 8x+3y=0 becomes, in the new system x′Oy′, the line given by the equation y′ =x′. Check the alternative that contains the value of cos(θ). Choose the correct alternative: a. 5/2√73 b. 5/√146 c. 11/√146 d. 5/√73 e. 11/√73

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A: Explanation of the answer is as follows

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A:

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A:

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A:

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