Some formulae for Inverse Trigonometry are
sin –1 (–x) = – sin -1 x
cos –1 (–x) = π – cos -1 x
tan –1 (–x) = – tan -1 x
cosec –1 (–x) = – cosec -1 x
sec –1 (–x) = π – sec -1 x
cot –1 (–x) = π – cot -1 x
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