arcos1=
arccos [tex] \frac{ \sqrt{3} }{2} [/tex] =
arccsin(-1)=
arctg(-1)=
arccos (-[tex] \frac{1}{2} [/tex])=
arctg 1=
arccos [tex] \frac{ \sqrt{3} }{2} [/tex] =
arccsin(-1)=
arctg(-1)=
arccos (-[tex] \frac{1}{2} [/tex])=
arctg 1=
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