Evaluate the following: (i) `cos e c\ 31o-sec59o` (ii) `(sin72o+cos18o)(sin72o-cos18o)`

Evaluate the following: (i) cos e c\ 31^@-sec59^@ (ii) (sin72^@+cos18^@)(sin72^@-cos18^@)

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

Evaluate the following: (i) sec50^osin40^o + cos40^o\ cos e c\ 50^o (ii) sec70^osin20^o-cos20^o\ cos e c\ 70^o

Evaluate the following: (i) sec50osin40o+cos40o cos e c 50o (ii) sec70osin20o-cos20o cos e c 70o

Evaluate the following: (i) sin450sin30o+cos450cos30o (ii) sin60o cos30o+cos600sin30o

Evaluate the following: (i) sin45osin30o+cos45ocos30o (ii) sin60ocos30o+cos60osin30o

Evaluate the following: (i) cos60ocos45o-sin60osin45o (ii) sin^2 30o+sin^2 45o+sin^2 60o+sin^2 90o

Evaluate the following : (sin72^(@)+cos18^(@))(sin72^(@)-cos18^(@))

Evaluate the following: (tan45o)/(cos ec30o)+(sec60o)/(cot45o)-(5sin90o)/(2cos00)

Evaluate the following: (i) cos600cos45o-sin60sin45o( ii) sin^(2)30o+sin^(2)45o+sin^(2)60o+sin^(2)90o