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

[" 10."(a+2)sin alpha+(2a-1)cos alpha=(2a+1)" if "tan alpha=],[[" (a) "(3)/(4)," (b) "(4)/(3)," (c) "(2a)/(a^(2)+1)" (d) "(2a)/(a^(2)-1)]]

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