Mohon bantuannya pakai cara yang runtut yah, agar mudah d mengerti.... Question from @Kaipah

April 2019 1 29 Report

Mohon bantuannya pakai cara yang runtut yah, agar mudah d mengerti.

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1. beberapa rumus:
$\cos{x}-\cos{y}=-2\sin{\frac{x+y}{2}}\sin{\frac{x-y}{2}}\Leftrightarrow \sin{x}\sin{y}=-\frac{\cos{(x+y)}\cos{(x-y)}}{2}$
$\cos{x}+\cos{y}=2\cos{\frac{x+y}{2}}\cos{\frac{x-y}{2}}\Leftrightarrow \cos{x}\cos{y}=\frac{\cos{(x+y)}\cos{(x-y)}}{2}$
a. $2\sin{60}sin{20}=-\cos{(60+20)}\cos{(60-20)}=-\cos{80}cos{40}$
d. $2\cos{50}cos{30}=\cos{(50+30)}\cos{(50-30)}=\cos{80}\cos{20}$

2. $\sin{a}+\sin{b}=2\sin{\frac{(a+b)}}{2}\cos{\frac{(a-b)}}{2}\rightarrow \sin{3a}+\sin{a}=2\sin{2a}\cos{a}$
$\sin{a}-\sin{b}=2\cos{\frac{(a+b)}}{2}\sin{\frac{(a-b)}}{2}$
$\cos{x}+\cos{y}=2\cos{\frac{x+y}{2}}\cos{\frac{x-y}{2}}$
$\cos{x}-\cos{y}=-2\sin{\frac{x+y}{2}}\sin{\frac{x-y}{2}}$
nomor 2 pake rumus di atas bisa kok

nomor 3 pakai rumus nomor dua aja

kalo nda paham komentar aja

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Sebutkan 5 contoh barang yang langka dan berikan alasannya kenapa barang tersebut menjadi langka.

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