`cos^(2)75^(0)+cos^(2)15^(0)-cos75^(0)cos15^(0)=`

cos15^(@)-cos75^(@)=

The value of cos^(2)75^(@)+cos^(2)45^(@)+cos^(2)15^(@)-cos^(2)30^(@)-cos^(2)60^(@) is

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

(cos^(2)1^(0)-cos^(2)2^(0))/(2sin3^(0)*sin1^(0)) is equal to

cos1^(0)cos2^(0)...cos179^(@)

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)

sin75^(@)-sin15^(@)=cos105^(@)+cos15^(@)

cos5^(0)+cos24^(0)+cos175^(0)+cos204^(0)+cos300^(@)= 1) (1)/(2) 2) 13)(3)/(2)4)2

cos24^(0)+cos5^(0)+cos175^(0)+cos204^(0)+cos300^(@)

Find the value of sec^(2)10^(@)-cot^(2)80^(@)+(sin15^(@)cos75^(@)+cos15^(@)sin75^(@))/(costhetasin(90^(@)-theta)+sinthetacos(90^(@)-theta)) .