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Find the exact value of cos 315 degrees.

answers: 3/2, -1/2,2/2, -2/2

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315 ° = 360 ° - 45 °

cos ( 360 ° - theta ) = cos ( theta )

cos ( 360 ° - 45 °) = cos ( 45 ° ) = square root ( 2 ) / 2

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