Question
Tue December 18, 2012 By: Amee
cos(sin-1 x)=1/9

find the value of x.

Expert Reply
Thu December 20, 2012
LET sin-1 x=a
therefor sin a=X
given cos a=1/9
 
therefor X^2=(sin a)^2=1-1/81=80/81
 
 
therefor x=(80/81)^(1/2)=(4root 5)/9
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