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tan(60) = 2 tan(30) / 1-tan^2(30)
Ingat!
tan(a+b) = tan(a) + tan(b) / 1-tan(a)tan(b)
Silahkan lihat buku matematika anda ^^.
Shg.
tan(60) = tan(30+30) = tan(30) + tan(30) / 1-tan(30)tan(30) = 2 tan(30) / 1-tan^2(30)
2.
cos30 - sin30 / 2tan30
cos30 = 3^(1/2) / 2
sin30 = 1/2
tan30 = sin30 / cos30
Silahkan hitung sendiri. Jangan males.