I want to prove that (2tanx)/(sec^2x)=sin2x.

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

Atriangular bandana has an area of 46 square inches. the height of the triangle is 5 3 4 inches. enter and solve an equation to find the length of the base of the triangle. use b to represent the length of the base.

Mindy bought 5/8 pound of almonds and a 3/4 pound of walnuts.which pair of fraction cannot be used to find how many pounds of nuts she bought in all.