If \[\tan \theta -\cot \theta =a\] and \[\sin \theta +\cos \theta =b,\] then \[{{({{b}^{2}}-1)}^{2}}({{a}^{2}}+4)\] is equal to [WB JEE 1979]

If \[\tan \theta -\cot \theta =a\] and \[\sin \theta +\cos \theta =b,\

1.	If \[\tan \theta -\cot \theta =a\] and \[\sin \theta +\cos \theta =b,\] then \[{{({{b}^{2}}-1)}^{2}}({{a}^{2}}+4)\] is equal to [WB JEE 1979]
A.	2
B.	-4
C.	± 4
D.	4
Answer» E.