156x6−624x4212x6−264x4+14x2−1=11+xc os4π9+11+xcos2π9+11−xcosπ9 i have no any idea. me

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

Afootball is throw by a quarterback to a receiver