The value of `cos^(-1){1/sqrt2(cos((9pi)/10)-sin((9pi)/10))}`

The value of cos^(-1){1/(sqrt(2))("cos"(9pi)/10-"sin"(9pi)/10)} is

The principle value of cos^(-1){1/sqrt2("cos"(9pi)/10-"sin"(9pi)/10)} is _____

The principal value of cos^(-1) {1/sqrt2 ("cos"(9pi)/10 - "sin"(9pi)/10)} is :

cos^(-1)((1)/(sqrt(2))(cos.(11pi)/(10)-sin.(pi)/(10))) is :

Find the value of the following inverse trigonometric expression: cos^(-1)(1/(sqrt(2))("cos"(9pi)/10-"sin"(9pi)/10))

Find the value of the following inverse trigonometric expression: cos^(-1)(1/(sqrt(2))("cos"(9pi)/10-"sin"(9pi)/10))

Find the value of cos^(-1)("cos"(9pi)/(8)) .

The value of cos((pi)/(10))cos((2 pi)/(10))cos((4 pi)/(10))cos((8 pi)/(10))cos((16 pi)/(10))

The value of sin^(-1)((cos(pi/9))

Write the value of sin^(-1)(cos(pi/9)) .