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OpenStudy (anonymous):
sin(2sin^-1 4/5)
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OpenStudy (anonymous):
use 2sin^-1x=sin^-1(2x*sqrt(1-x^2)) thus sin(2sin^-1 4/5) =sin(sin^-1(2*4/5*3/5))=24/25
OpenStudy (anonymous):
@matricked where did the 3/5 come from?
zepdrix (zepdrix):
|dw:1353375948035:dw|
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