\( (a+2) \sin \alpha+(2 a-1) \cos \alpha=(2 a+1) \) if \( \tan \alpha \) is
(1) \( 3 / 4 \)
(2) ...
\( (a+2) \sin \alpha+(2 a-1) \cos \alpha=(2 a+1) \) if \( \tan \alpha \) is
(1) \( 3 / 4 \)
(2) \( 4 / 3 \)
(3) \( 2 a /\left(a^{2}+1\right) \)
(4) \( 2 a /\left(a^{2}-1\right) \)
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