What is the value of `( -1 - 2 )^2`

What is the value of ( 1 - 2 sin ^(2) theta cos^(2) theta )/( sin ^(4) theta + cos^(4) theta ) + 4 equal to

If [ sqrt (a ^(2) + b^(2) + ab)] + [ sqrt (a^(2) + b^(2) - ab)] = 1 then what is the value of (1 - a^(2)) (1 - b^(2)) ?

What is the value of (1xx 2 +2xx 3-3xx 4 +4xx 5 -5 xx 6 +6 xx 7) ?

What is the value of [ 1 - sin ( 90 - 2A ) ] // [ 1 + sin ( 90 + 2 A ) ] ?

What is the value of 3^1+3^(-1)+3^2+3^(-2) ?