(1)(cos18)/(sin72)

Show that (without using table of trigonometric ratios) :(i) (cos18^0)/(sin72^0)=1

Find the value of (cos18^(@))/(sin72^@)

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

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

Prove that sin 12^(@) sin18^(@)sin42^(@) sin48^(@) sin 72^(@) sin78^(@)=(cos18^(@))/(32) .

Prove that sin 12^(@) sin18^(@)sin42^(@) sin48^(@) sin 72^(@) sin78^(@)=(cos18^(@))/(32) .

Prove that sin 12^(@) sin18^(@)sin42^(@) sin48^(@) sin 72^(@) sin78^(@)=(cos18^(@))/(32) .

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

Without using Trigonometric Tables evaluate the following :- (cos58^@)/(sin32^@)+(sin22^@)/(cos68^@)-(cos38^@ cosec52^@)/(tan18^@tan35^@tan60^@tan72^@tan55^@) .