Cassie simplified the composed function f(x)= cot(arcsin x). Her work is shown below. In which step did Cassie make her first error?

step 1
step 2
step 3
step 4
She didn't make any errors

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.