- -2cos^2(x)=3cos(x+1) solve the equation using the exact intervals [0,2pi)?

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Determine the angle measure between vectors u and v: u = – 3i + 3j and v = 3i + 2j .? What number of atoms of phosphorus are present in 1.16 g of each of the compounds listed?
(a) P4O6
(b) Ca3(PO4)2 (c) Na2HPO4? When gravity is the only force working on an object the object is in? Vector x is such that x*a = 0 for any vector a. Need to prove x = 0? A diamond contains 6x10^21 atoms of carbon.What amount (moles) of carbon are in this diamond?What mass(grams) of carbon are in this diamond?