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[sin(pi)/(10)*sin(13 pi)/(10)" is equal ...

[sin(pi)/(10)*sin(13 pi)/(10)" is equal to : "],[[" (a) "(1)/(2)," (b) "-(1)/(2)],[" (c) "-(1)/(1)," (d) "1]]

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The value of sin (pi)/(10) sin (13 pi)/(10) is

The value of sin((pi)/(10))sin((13 pi)/(10)) is