arcsin x=y ⇔ siny=x
sin (-π/4)=-√2/2
arcsin(-√2/2)=-π/4
cos(π/6)=√3/2
arccos(√3/2)=π/6
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arcsin x=y ⇔ siny=x
sin (-π/4)=-√2/2
arcsin(-√2/2)=-π/4
cos(π/6)=√3/2
arccos(√3/2)=π/6