Please help it will be fast and easy

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Adiverr from the university of florida women’s swimming and diving team is competing in the ncaa zone b championships

50 people men and women were asked if they watched at least one sport on tv. 20 of the people surveyed are women, but only 9 of them watch at least one sport on tv. 16 of the men watch at least one sport on tv. make a a two-way table and a relative frequency table to represent the data.