[" 12."(a+2)sin alpha+(2a-1)cos alpha=(2...

[" 12."(a+2)sin alpha+(2a-1)cos alpha=(2a+1)" if tan "alpha=," (C) "(2a)/(a^(2)+1)],[[" (A) "(3)/(4)," (B) "(4)/(3)," (C) "(2a)/(a^(2)+1)," (D) "(2)/(a^(2))]]

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