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There is a triangle with an acute angle α. 

What is [tex]sin \alpha [/tex] equal to if [tex]cos \alpha =\frac{1}{4}[/tex] ?

Answer :

lakshmidevi258
sin^2 α+cos^2 α=1
sin^2 α=1-cos^2 α
         =1-(1/16)
          =15/16
sin α=√(15/16)
     =(√15)/4

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