Evaluate the following: `i^(19)`

Evaluate the following: (i) i^(135) " "(ii) i^(19) " " (iii) i^(-999) " " (iv) (-sqrt(-1))^(4n + 2), n in N .

Evaluate the following: ((19)/(-31))^(2)

Evaluate the following : "^19C_17+ ^19C_18 .

Evaluate the following : (19/-23)^2

Evaluate the following : |-19|-|-13| .

Evaluate the following: (i) (sin20^@)/(cos70^@) (ii) (cos19^@)/(sin71^@)

Evaluate the following: (i) (sin20o)/(cos70o)( ii) (cos19o)/(sin71o)

Evaluate the following (-8) xx (-19) xx (-15)