Some formulae for Inverse Trigonometry are

sin
^{
–1
}
(–x) = – sin
^{
-1
}
x

cos
^{
–1
}
(–x) = π – sin
^{
-1
}
x

tan
^{
–1
}
(–x) = – tan
^{
-1
}
x

cosec
^{
–1
}
(–x) = – cosec
^{
-1
}
x

sec
^{
–1
}
(–x) = – sec
^{
-1
}
x

cot
^{
–1
}
(–x) = π – cot
^{
-1
}
x