" questions 9."cos^(1)(-(1)/(sqrt(2)))

cos(cos1)>(1)/(sqrt(2))

cos(cos1)>(1)/(sqrt(2))

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))

cos^(-1)(sqrt(1+cos x)/2)

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

cos^(-1)(sqrt((1+cos x)/2))

cos^(-1)(cos(2cot^(-1)(sqrt(2)-1)))

cos^(-1){cos2cot^(-1)(sqrt(2)-1)}

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