- WHAT COUNTY WAS NAMED AFTER an Italian explorer/ ?

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I need to know Molar mass of butane and all i know is partial pressure of dry butane=720.546 barometric pressure is 741.426? How do I find the value of cos B from: tan B/2, given tan B = -sqrt(11)/5, with pi/2 < B < pi The answer is -5/6, but how do they get it? What are the values for which f(x) is less than or equal to 0 & the number at which f has a relative maximum & the relative maxima of f.? Are inventors considered geniuses? How do we know that biologically separate races no not exist?