" H."sin^(2)75^(@)-sin^(2)15^(@)=sin60^(@)

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The value of sin^(2)15^(@)+sin^(2)25^(@)+sin^(2)65^(@)+sin^(2)75^(@) is

Evaluate each of the following :- sin^(2)30^(@)+sin^(2)45^(@)+sin^(2)60^(@)+sin^(2)90^(@)

Show that sin^(2) 75^(@) - sin^(2) 15^(@) = (sqrt(3))/(2)

If (x-xtan^(2)15^(@))/(1+tan^(2)15^(@))=sin60^(@)+cos30^(@) , then what is the value of x ?

Show that : cos^(2)60^(@)-sin^(2)60^(@)=-sin30^(@)

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

What is the value of sin^(2) 15^(@) + sin^(2) 20^(@) + sin^(2)25^(@) + ……… + sin^(2) 75^(@) ?

sin^(2)5^(@)+sin^(2)10^(@)+sin^(2)15^(@)+ .....+sin^(2)85^(@)+sin^(2)90^(@) is equal to

sin 75^(@) + sin 15^(@) =