Rewrite with only sin x and cos x. cos 2x - sin x

cos2x - sin2x - sin x
cos2x - sin3x
cos2x + sin2x + sin x
cos2x - 3 sin x

Which expression is equivalent to the expression shown?

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.