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

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

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

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

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

cos^(-1)(1/(sqrt(2)))+sec^(-1)(-sqrt(2))=

If phi(x)=2cos^(-1)((2)/(sqrt(x)))+sin^(-1)((4sqrt(x-4))/(x)), then phi'(9) is equal to

Prove that tan ^(-1) ""(1)/(4) + tan ^(-1) ""(2)/(9) = cos ^(-1) ((2)/(sqrt5))

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