Practice problem
If xxx is a real number such that cos(2x)=710,\cos(2x) = \frac{7}{10},cos(2x)=107, find the value of cos2(x).\cos^2(x).cos2(x).
310\frac{3}{10}103
1320\frac{13}{20}2013
710\frac{7}{10}107
1720\frac{17}{20}2017
Type a concept, like “slope” or “photosynthesis”.
