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Tan b = 1/4
Tan (a+b) = (tan a + tanb)/(1-tana*tanb)
Tan (a+b) = (1/12 + 1/4)/(1- 1/12*1/4)
Tan (a+b) = 4/12 / 47/48
Tan (a+b) = 4/12 * 48/47 = 16/47
Tan 2b = (2*tanb)/(1 - (tanb)^2)
Tan 2b = (2*1/4)/ (1-(1/4)^2)
Tan 2b = 1/2 / 15/16
Tan 2b = 1/2 * 16/15 = 8/15
Semoga terjawab dan membantu ya. Semangat belajar trigonometrinya.