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" (v) "sin(pi)/(10)+sin(13 pi)/(10)=(-1)...

" (v) "sin(pi)/(10)+sin(13 pi)/(10)=(-1)/(2)

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

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

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

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

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

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

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

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

Find the value of (a) sin(pi)/(10)+sin(13pi)/(10) (b) cos^(2)48^(@)=sin^(2) 12^(@)

Find the value of (a) sin(pi)/(10).sin(13pi)/(10) (b) cos^(2)48^(@)-sin^(2) 12^(@)