E to the x, Dy Dx; E to the x, Dx
Cosine, secant, tangent, sine
Three point one four one five nine
Square root, cube root, BTU
Slipstick, slide rule, Yea, Purdue!
Istill can use a sliderule. It exercises the skill of scientific notation. Besides the logarithmic ruler is a handy tool for reading semilogatrithmic and logrithmic charts and plots from pdf files.