What is the value of `"sin"^(-1)(4)/(5)+"sec"^(-1)(5)/(4)-(pi)/(2)`?

Find the value of sin^-1(sin(4pi)/5)

Find the value of sin^(-1) (sin. (4pi)/5)

The value of sec^(-1)(sec(8pi)/5) is

Find the value of sin^(-1)(sin((5pi)/(4)))

What is the value of expression cos^(2)((pi)/(8))+4cos^(2)((pi)/(4))-sec((pi)/(3))+5tan^(2)((pi)/(3))+sin^(2)((pi)/(8)) ?

Value of sec^(-1)(sec.(4pi)/3) is

Value of sec^(-1)(sec.(4pi)/3) is

Find the value of : sin ^(-1)(sin ((5pi )/(4)) )