20 points im sad right know please help and give real help been trolled all day

Write the expression as a constant , a single trigonometric function, or a power of a trigonometric function. sin x cos x/ tan x

If you could answer these your a life saver

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.