Please help i will give brainliest. Determine the missing length of the triangle below. Show your work.

Match each expression with its simplified form.

Aregular hexagon rotates counterclockwise about its center. it turns through angles greater than 0° and less than or equal to 360°. at how many different angles will the hexagon map onto itself?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).