- Find an exact expression of cos (u+v)?

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Can someone check my work for mat probability? Hi
For my science prac, I need to write an equation as to how the following salts ionize in water
1. KNO3
2. K2SO4? Eq reached 100g CuO and 50g Cu.NH3 is 0.0171 M, H2O is 0.341 M,and N2 is 0.514 M. What the eq constant
2NH3(g)+3CuO(s)↔3H2O(g)+ N2(g)+3Cu(s)? A fuel cell uses- energy to produce- energy. (12.3)? Rule of Thumb for Estimating lightning or explosion?