- If A.B=|A×B| then the angle between A and B is:?

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Find all θ between 0 and 2π that satisfy the following: tan θ = -2.662 and cos θ > 0.? Find the Left Riemann Sum that approximates the area under the curve of y=e^(4x) on the interval [0,2] with 8 rectangles.? How do cows have milk? Please Help!!
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