Discover Questions

Is -1=1/-1 ? What is the difference between qualitative and quantitative research? Find the derivate of the following problems.
a) f(x)=x^3
b) f(x)=tan(x)
c) f(x)=cos(2x)
d) f(x)= e^x? Find the equation of directrices of ellipse 9x²+4y²=36. Isn't it y=+/-9/2? When sample size is less than 30 what is the best test z test, T test, Anova test or Chi square test?