+0  
 
+1
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Math problem: Is x=cos-1(21/30) but how do I get the cos-1 in this calculator?

havecuteness08  Apr 25, 2017
 #1
avatar+229 
+2

dude, its Acos

liveevillevi  Apr 25, 2017
 #2
avatar+27243 
+2

See reply at https://web2.0calc.com/questions/help-with-this-calculator#r1

Alan  Apr 25, 2017

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