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Factorise: a^4-13a^2+36 ? What is the relationship between Higgs boson and graviton? My teacher uses white board marker and it makes me cough and its odour makes my throat burn, why? Taylor series- I want a proof why the Taylor series work for complex numbers too, given it is centered at an analytic point.? A jar contains nickels and pennies. There's 56 coins in jar totaling $1.52. how many pennies are in jar?