cos(-1710^(@))

Evaluate the following: i) tan135^(@) ii) sec150^(@) iii) cot240^(@) iv) "cosec"1950^(@) v) cos(-1125^(@)) vi) tan(-1470^(@)) vii) tan1710^(@) viii) cot(-1770^(@))

Evaluate the following: i) tan135^(@) ii) sec150^(@) iii) cot240^(@) iv) "cosec"1950^(@) v) cos(-1125^(@)) vi) tan(-1470^(@)) vii) tan1710^(@) viii) cot(-1770^(@))

The value of cos(-89^(@))+cos(-87^(@))+cos(-85^(@))+…+cos(85^(@))+cos(87^(@))+cos(89^(@)) is equal to

The value of cos(-89^(@))+cos(-87^(@))+cos(-85^(@))+…+cos(85^(@))+cos(87^(@))+cos(89^(@)) is equal to

The value of cos(-89^(@))+cos(-87^(@))+cos(-85^(@))+…+cos(85^(@))+cos(87^(@))+cos(89^(@)) is equal to

(1-(cos61^(@))/(cos1^(@)))(1-(cos62^(@))/(cos2^(@)))(1-(cos63^(@))/(cos3^(@)))...(1-(cos119^(@))/(cos59^(@)))

cos A + cos (120 ^ (@) + A) + cos (120 ^ (@) - A) =

A=cos20^(@)cos40^(@)cos60^(@)cos80^(@),B=cos60cos42^(@)cos66^(@)cos78^(@) and C=cos36^(@)cos72^(@)cos108^(@)cos144^(@) then

A=cos 20^(@)cos 40^(@) cos60^(@)cos 80^(@) , B=cos6^(@)cos42^(@)cos66^(@)cos78^(@) and C=cos 36^(@)cos72^(@)cos 108^(@)cos 144^(@) then