hi, just have a few questions

use chain rule to find d/dx (1/arcsin(x^2))

i know d/dx (arcsinx)= 1/(1-x^2)^1/2

also for x in domain [-1,1] prove that arcsinx + arccosx = pi/2

for this i took the derivatives of the LHS whiched equaled zero but dont know where to go from here

thanks