Evauluating expressions without answering in decimals?

imported_o_o

New member
I'm stuck on evualuating expressions without answering them in decimals.

i. arctan (-sqrt 3)
My guess is arctan i(in italics) (sqrt 3)

ii. arccos (-1/2)
again my guess is arccos i(in italics) (-1/2)

iii. arcsec (sqrt 2)

iv. arcsin (sqrt3 / 2)
 
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