the trigonometric equation sin-1x=2 sin-1alpha has solution for the
1.|alpha|<=1/root2       2.|alpha|<=1/4
3.|alpha|<1/2                 4.|alpha|<=1

Dear student,
sin-1x=2sin-1αwe know -π2sin-1xπ2then -π22sin-1α π2-π4sin-1α π4-12α 12 answer 1

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