- Ti Nspire CX CAS gives d/dx of tan(x) as 1/cos^2x when it should be sec^2x. Why is this happening?

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Chemistry Question Calculate the mass of Fe(NH4)2(SO4)2.6H2) required to prepare 25ml of 1.0M Fe(NH4)2(SO4)2? Could the Kilauea volcano erupt with enough force to affect the earth's orbit, like a giant jet engine? Could a light sail be used to propel ground vehicles? If (2x+1/3x)=6 what is the value of (3x-1/2x)^2? Is the giraffe the modern day equivelent to th e brontosaurus?