How do you find the domain and range of #arcsin(1-x^2)#?

Question

4374 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-08-10T13:02:06

Domain: #abs x <= sqrt 2#
Range: #[ - pi/2, pi/2 ]#

#y = arcsin ( 1 - x^2 )# is constrained to be in #( -pi/2, pi/2 )# and,

as #( 1 - x^2 )# is a sine value, #- 1 <= 1 - x^2 <= 1#

#rArr -1 <= 1 - x^2 rArr x^2 <= 2 rArr -sqrt2 <= x <= sqrt 2#.

See graph, depicting domain and range.
graph{(y-arcsin(1-x^2))(y-pi/2 +0y)(y+pi/2+0y)=0}

Had it been the piecewise wholesome sine inverse

#(sin)^(-1)( 1 - x^2 ) = kpi + (-1)^k arcsin( 1 - x^2 )#, you can use

the common-to-both inverse # 1 - x^2 = sin y#, to get the

wholesome unconstrained graph, for range unlimited.
graph{1-x^2-sin y = 0[ -20 20 -10 10] }