The value of expression
\( \mathrm{E}=3\left(\sin ^{4} \theta+\cos ...
The value of expression
\( \mathrm{E}=3\left(\sin ^{4} \theta+\cos ^{4} \theta\right)-2\left(\sin ^{6} \theta+\cos ^{6} \theta\right)+\frac{\sin (\pi-\alpha)}{\sin \alpha-\cos \alpha \tan \frac{\alpha}{2}}-\cos \alpha \) is
\( \mathrm{P} \)
(A) 0
(B) 1
(C) 2
(D) \( -1 \)
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