`cos38^(@)cos52^(@)-sin38^(@)sin52^(@)=0`

The value of cos38^(@)cos52^(@)-sin38^(@)sin52^(@) is :

Find the value of: (i)tan90^@ (ii) cos38^@cos52^@-sin38^@sin52^@

cos 38^(@) cos 8^(@) + sin 38^(@)sin 8^(@) is equal to

Evaluate : cos 38^@ cos 52^@ - sin 38^@ sin 52^@ .

sin38^(@)+sin22^(@)=sin82^(@)

(2sin38^(@))/(cos52^(@))

cos52^(@)+cos68^(@)+cos172^(@)=?

Choose the correct answer in each of the following questions: (cos38^(@)"cosec"52^(@))/(tan18^(@)tan35^(@)tan60^(@)tan72^(@)tan55^(@))=?

The value of (cos^(n)38^(@)-cot^(n)52^(@))/(sin^(n)52^(@)-tan^(n)38^(@))=?

(sin18^(0))/(cos72^(0))+(sin22^(0))/(cos68^(@))-(cos38^(0)cos ec52^(0))/(tan18^(@)tan35^(@)tan60^(@)tan72^(@)tan55^(@))