1.

The trigonometric equation `sin^(-1)x=2sin^(-1)a`has a solution forall real values (b) `|a|

Answer» `-pi/22<=sin^(-1)x<=pi/2`
`-pi/2<=2sina<=pi/2`
`-pi/4<=sina<=pi/4`
`-1/sqrt2<=a<=1/sqrt2`
`|a|<=1/sqrt2`.


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