Find the value of `cos^2 112 1/2^@-sin^2 52 1/2^@`

sin^2 52 1/2^@-cos^2 7 1/2^@

1. Find the value of 2.52/ 1.2

Find the value of cos^(2)112^((1^(0))/(2))-sin^(2)52^((1^(0))/(2)) cos^(2)52^((1^(0))/(2))-sin^(2)22^((1^(0))/(2))

Find the value of cos^(2)52(1^@)/(2) - sin^(2)22 (1^@)/2

Find the value of 2 cos ^(-1) (1/2) +sin^(-1) (1/2)

Find the value of cos^(-1) { sin ( -π/2) }

Find the value of cos^(-1) (1/2) +2 sin^(-1)(1/2)

Find the value of cos^(-1) (-1/2) -2 sin^(-1) (-1/2)

Find the value of sin [ arc cos (- 1/2)]