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" Prove : "4sin pi/10sin13 pi/10=-1...

" Prove : "4sin pi/10sin13 pi/10=-1

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

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

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

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

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

Prove that: sin(pi/10)+sin((13pi)/10)=-1/2

Prove that: (sin pi)/(10)+(sin(13 pi))/(10)=-(1)/(2)

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

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

Prove that: sin(9pi)/(10) + sin(13pi)/(10)=-1/2