Ahhh more math help please

I'm still on my trig homework...

Is the Arcsec2= 60 degrees?

Arcsin squareroot of 2/2=45 degrees?

Arccot 1/squareroot of 3=60 degress?

Arctan (-squareroot of 3)= -60 degrees?

Sin (arcsec(-25/7)) = 24/-25?

Sin (arcos .7)=squareroot .51/1?

Arctan squareroot of 3= 60 degrees?

Arccsc squareroot of 2= 45 degrees?

Arccos squareroot of 3/2=30 degrees?

last 4 are correct ...8 out of 9 is not too bad

all of the answers are correct except for arccos(squareroot of 3/2)..it is undefined

i used a graphing calculator...

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