- 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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Sodium phosphat, Na3PO4, can be? Limit as x approaches 0 of (x + 3sinx)/(2x) ? i know the answer is two but i dont know how it came to be. help.? Where can I get to read the detailed design of Pierluigi Ferrara in Nuovo Pignone compressor ? Find f (-3) and f (-5) if (x) = |2-x| + |4-x|? Any good ideas for a business engineering club in highschool ? ?