Trigonometry: solve for x: cosx−√3 /4 sin(2x)=0

i got -2/√3 and 2√3 /3.

i don't think i did it right. in advance!

According to the normal model, what percent of receivers would you expect to gain fewer yards than 2 standard deviations below the mean number of yards

Which of these tools or constructions is used to inscribe a hexagon inside a circle?

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?