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phi/4= 45
f(45 derjat) = sin 2(45) = sin 90 = 1
f( 165 derjat) = sin 2( 165)= sin 330 = -1/2
jadi nilai f(phi/4)-f(11phi/12) = 1-(-1/2) = 3/2
nomor dua saya kurang paham maksud pertanyaannya mohon maaf sebelumnya ;)