cosalpha = sqrt(3)/4 in quadrant I cosbeta = -(sqrt2)/3 in quadrant II Find the exact value of cos(alpha - beta)
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Hello, Neversh! Given: . Find the exact value of: . We know: . Since , then . . is in Quadrant 1, so: . Since , then . . is in Quadrant 2, so: . We know: . Substitute the above four values: . . Therefore: .
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