The value of `(sin^(2)(pi)/(10)+sin^(2)(4 pi)/(10)+sin^(2)(6 pi)/(10)+sin^(2)(9 pi)/(10))` is

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sin^(2)(pi)/(4)+sin^(2)(3 pi)/(4)+sin^(2)(5 pi)/(4)+sin^(2)(7 pi)/(4)=2

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

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

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

Prove that: (sin^(2)pi)/(18)+(sin^(2)pi)/(9)+(sin^(2)(7 pi))/(18)+(sin^(2)(4 pi))/(9)=2

The value of sin^(6)((pi)/(49))+cos^(6)((pi)/(49))-1+3sin^(2)((pi)/(49))cos^(2)((pi)/(49)) is equal to

(sin((pi)/(10))+sin(13(pi)/(10)))(cos^(2)((pi)/(6))-cos^(2)((pi)/(10))) is equal to

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