" 2) "sin((-17 pi)/(4))

sin (17 (pi) / (3))

(i) Find tan(- (2pi)/(3)), cos 315^(@), sec210^(@), cosec225^(@), Tan(- (23pi)/(3)), cot(-300^(@)) and sin. (-(17pi)/(4)) .

Value of expression sin ((pi) / (9)) + sin ((2 pi) / (9)) + sin ((3 pi) / (9)) + ... + sin ((17 pi) / ( 9)) =

tan ((11 pi) / (3)) - 2sin ((9 pi) / (3)) - (3) / (4) cos ec ^ (2) ((pi) / (4)) + 4cos ^ ( 2) ((17 pi) / (6)) = (3-2sqrt (3)) / (2)

cos((pi)/(4)+A) cos((pi)/(4) - B) + sin ((pi)/(4) +A) * sin((pi)/4-B)=

Evaluate each of the following: sin^(-1)((sin(13 pi))/(7))( ii) sin^(-1)((sin(17 pi))/(8))( iii) sin^(-1){(s in-(17 pi)/(8))}

sin(pi)/(4)*sin(3 pi)/(4)*sin(5 pi)/(4)*sin(7 pi)/(4)=

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

Prove that sin""A/2+sin ""B/2+sin ""C/2=1+4 sin ((pi-A)/(4))sin"" (pi-B)/(4)sin ((pi-C)/(4))," If A+B+C "=pi