all students take calculus (suomeksi)

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(lb, en, math) (n-g, A mnemonic for the sign values of all the trigonometric functions in the two-dimensional Cartesian coordinate system. The initial letters ASTC — for ''all'', ''sine'', ''tangent'', ''cosine'' — signify which of the functions are positive, in the order of the quadrants, starting at the top right and moving counterclockwise.)