Bantu ya kakak, yg jago matematika tolong saya

Trigonometri

(sin 75 + cos 75) / ( tan 240) =
= (sin 75 + sin(90-15)) / tan(180+60
= (sin 75 + sin 15) / (tan 60)
= (2 sin 1/2  (75+15) cos 1/2(75-15)) / (tan 60)
= 2 (sin 45). (cos 30) / (tan 60)
= 2 (1/2√2 )(1/2√3 ) / (√3)
= 2 (1/2√2 )(1/2)
= 1/2 √2

Semoga paham yaa..:))

koreksi:
[tex]u^{2}=\frac{3}{2}[/tex]
[tex]u=\sqrt{\frac{3}{2}}[/tex]
[tex]u=\frac{\sqrt{3}}{\sqrt{2}}[/tex]

bagian terakhir:
[tex]=\frac{\frac{\sqrt{3}}{\sqrt{2}}}{\frac{3}}[/tex]
[tex]=\frac{1}{\sqrt{2}}[/tex]
[tex]=\frac{\sqrt{2}}{2}[/tex]