600 IS WHAT OF 900% TELL ME PLEASE I WILL GIVE POINTS AND BRAINLETS

If tana tanb=k, show that(1+k)cos(a+b)=(1-k)cos(a-b)

Arunning track in the shape of an oval is shown. the ends of the track form semicircles. a running track is shown. the left and right edges of the track are identical curves. the top and bottom edges of the track are straight lines. the track has width 56 m and length of one straight edge 130 m. what is the perimeter of the inside of the track? (π = 3.14) 260.00 m 347.92 m 372.00 m 435.84 m

How can you construct perpendicular lines and prove theorems about perpendicular lines