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4. (10pts) Recall the identity: cos(x+ y) = cos(x) cos(y) - sin(x) sin(y). Use this identity to compute cos(-15). Show all work

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4. (10pts) Recall the identity: cos(x+ y) = cos(x) cos(y) - sin(x) sin(y). Use this identity to compute cos(-15). Show all work

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