`sin^(2)50^@+cos^(2)50^@=?`

Evaluate: sin^(2)40^(@)-cos^(2)50^(@)

cos^(2)10^(@)+cos^(2)50^(@)+cos^(2)70^(@)=?

cos^(2)10^(@)+cos^(2)50^(@)-cos10^(@)cos50^(@) is equal to

Without using trigonometric tables,evaluate each of the following: (sin^(2)20^(@)+sin^(2)70^(@))/(cos^(2)20^(0)+cos^(2)70^(@))+(sin(90^(@)-theta)sin theta)/(tan theta)+(cos(90^(@)-theta)cos theta)/(cot theta)+cos(40^(0)+theta)-sin(50^(@)-theta)+(cos^(2)40^(0)+cos^(2)50^(@))/(sin^(2)40^(0)+sin^(2)50^(@))

What is the value of 4(cos^(2)(10^(@))+cos^(2)(50^(@))-sin40^(@)sin80^(@))

The value of cos^(2)10^(@)-cos10^(@)cos 50^(@)+cos^(2)50^(@) is k/2 . The value of k is ________.

The value of cos ^(2) 10^(@) cos 50^(@) + cos ^(2) 50^(@) is equal to

The value of (sin^2 60^@- cos^2 45^@+ sec 60^@+ cos^2 40^@+ cos^2 50^@) is equal to: (sin^2 60^@- cos^2 45^@+ sec 60^@+ cos^2 40^@+ cos^2 50^@) का मान किसके बराबर है?

The value of cos ^(2) 10^(@) - cos 10^(@) cos 50^(@) + cos ^(2) 50^(@) is equal to