- Simplify the trigonometric expression. (9 sin x sec x)/ tan x?

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What is the comparative reactivity of the elements in group 1A of the periodic table? What is the frequency of VHF that can be transmitted by astronauts around the Earth? ... fm or am or ssb mode? What is the mass, in grams, of Vitamin C, which contains 0.867 grams of carbon? (Vitamin C, C6H8O6.)? What causes a meteor shower? How do i factor 12x^(3)-24x^(2)+12x+24? I tried grouping but I couldn't find the answer... is it factorable?