\( \sin ^{2} 20^{\circ}+\cos ^{2} 160^{\circ}-\tan ^{2} 45^{\circ}= \) (a) 2 (b) 0 (c) 1 (d) \( ...

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\( \sin ^{2} 20^{\circ}+\cos ^{2} 160^{\circ}-\tan ^{2} 45^{\circ}= \)
(a) 2
(b) 0
(c) 1
(d) \( -2 \)
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