Find the value of `cos210^o`

Find the value of : cos 210^@ .

Find the value of : cos 210^0

Find the value of cos(-60^o)

Find the value of :- sin210^@

Find the value of cos[22(1/2)]^o

Find the value of cos(-765^o)cosec(-1110^o)sin(1410^o)

The value of cos210^(@) is

Find the value of tan210^(@)

Find the value of :- (210)^3

Find the value of: (i) cos 210^(@) (ii) "sin" 225^(@) (iii) "tan" 330^(@) (iv) cot(-315^(@)) (v) "sec"(11pi)/(4)