Which is equal to 1? Select all that apply. A. sin 30° B. sin 45° C. cos 45° D. cos 60° E. tan 30° F. tan 45°

(40 points) i need some . an answer definition is appreciated as well.

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

Ineed in figuring out this problem.