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[" The value of "sin(pi)/(10)sin(13 pi)/...

[" The value of "sin(pi)/(10)sin(13 pi)/(10)is],[[" 1) "(1)/(2)," 2) "-(1)/(2)," 3) "-(1)/(4),41]]

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

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

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

sin(pi/10)sin((13pi)/10)=

sin((pi)/(10))sin((3pi)/(10))=?

sinpi/10+sin(13pi)/(10)=?

sin(pi/10)sin((3pi)/10)=

sin ((pi) / (10)) sin ((3 pi) / (10))

Prove that: sin((pi)/(10))sin((13 pi)/(10))=-(1)/(4)