What is the rate of change in the graph below? Link posted.

After applying the composition r0.90 ry to rs what are the coordinates of r' and s'? a.r'(–3, 1),  s'(–3, 5)b.r'(–1, 3),  s'(–5, 3)c.r'(1, 3),  s'(5, 3)d.r'(5, 3),  s'(1, 3)

Answer! if you don’t mind, can you explain

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle