" Q."20." Evaluate: "10times(1-cot^(2)45^(@))/(1+sin^(2)90^(@))

Evaluate 10*((1-cot^(2)45^(@))/(1+sin^(2)90^(@)))

(1 - cot^(2)45^(@))/(1 + cot^(2)45^(@)) =

(1 - cot^(2)45^(@))/(1 + cot^(2)45^(@)) =

Evaluate sin(2 cot^-1 (-5/12))

Evaluate: (2)/(3)(cos^(4)30^(@)-sin^(4)45^(@))-3(sin^(2)60^(@)-sec^(2)45^(@))+(1)/(4)cot^(2)30^(@)

Evaluate each of the following :- 4/(cot^(2)30^(@))+1/(sin^(2)60^(@))-cos^(2)45^(@)

Find the value of : sin^(2)30^(@) cos^(2) 45^(@)+4tan^(2)30^(@) + 1/2 sin^(2) 90^(@) + 1/8 cot^(2) 60^(@) .

(7sin ^ (2) 30 ^ (@) + 3cos ec ^ (2) 60 ^ (@) - cot ^ (2) 45 ^ (@)) / (sin ^ (2) 70 ^ (@) + sin ^ (2) 20 ^ (@)) + 2sin ^ (2) 30 ^ (@) - 2cos ^ (2) 30 ^ (@) 20

Evaluate : (sin^(2)30^(@)+sin^(2)45^(@)-4cot^(2)60^(@))/(2sin30^(@)cos30^(@)+(1)/(2)tan60^(@))