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Find sin(2A) if sin(A) = 1/4 and 0 <= A <= pi/2.

 Dec 25, 2021
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sin a = 1/4   then cos a = sqrt(15)/4

 

sin 2α = 2 sin α cos α         sin and cos are both positive in Q I   (from 0 to pi/2  is Q I )

  sin 2a = 2 (1/4) (sqrt(15)/4)     <==== take it from here !  

 Dec 26, 2021

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