Use the fundamental identities to fully simplify the expression
3sin^3 x * csc x + cos^2 x + 2 cos(-x) * cos x

i simplified it until this
3sin^2 x + cos^2 x +2cos^2(-x)*cos(x)

i know the answer is suppose to be 3 but i don't know how to simplify further to get to 3

Given a(-12,5) and b(12,29) find the point that divides the line segment ab three-eighths of the way from a to b

Worth 30 points! in this diagram, both polygons are regular. what is the value, in degrees, of the sum of the measures of angles abc and abd?

Someone answer asap for ! max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a. the median of max’s data is 250 b. more than half of the data points max recorded were 177 centimeters. c. a data point chosen at random is as likely to be above the mean as it is to be below the mean. d. every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.