`Cos255^(0)+sin165^(0)`=

If cos25^(0)+sin25^(0)=K, then cos50^(@) is equal to

Evaluate: det[[cos15^(0),sin15^(0)sin75^(0),cos75^(0)]]

Which of the following number(s) is/are rational? (a)sin 15^(0)(b)cos15^(0)(c)sin15^(0)cos15^(0)(d)sin15^(0)cos75^(0)

The value of (cos24^(0))/(2tan33^(0)sin^(2)(57^(0)))+(sin162^(0))/(sin18^(0)-cos18^(0)tan9^(0))+cos162^(0) is equal to

cos25^(0)cos35^(0)-sin10^(0)sin20^(0) ,

Prove that: (cos11^(0)+sin11^(0))/(cos11^(0)-sin11^(0))=tan56^(@)

Show that sin70^(0)cos10^(0)-cos70^(0)sin10^(0)=(sqrt(3))/(2)

The value of (cos^(2)33^(0)-cos^(2)57^(0))/(sin21^(0)-cos21^(0)) is

Find the values of the following: sin75^0 (ii) cos75^0 (iii) sin15^0 (iv) cos15^0

sin463^(@)*cos373^(0)+cos823^(@)*sin193^(@)=