Berikan pembahasan soal nomer 5.b saja Terimakasih U cos (a + 8) 0. 4 Hitunglah bentuk berikut dengan menggunakan rumus co a. cos 1650 b__ cos 1050 5_ Buktikanlah! cos (& + a: B) _1 ~ tan & tan 8 cos & cos 8 2T 4 b_ cOS & + COS 0 + + COS C + 3t| =0. 3 3
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We can use the angle addition formula for cosine, which is: cos(A + B) = cos(A)cos(B) - sin(A)sin(B) We know that tan(A) = sin(A) / cos(A) and tan(B) = sin(B) / cos(B). So, we can rewrite sin(A) and sin(B) as: sin(A) = tan(A)cos(A) and sin(B) = Show more…
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$$ \text { If } \cos A=\frac{3}{5}, \cos B=\frac{5}{13}, \text { prove that } \sin ^{2} \frac{A-B}{2}=\frac{1}{65}, \cos ^{2} \frac{A-B}{2}=\frac{64}{65} $$
$25 \cos A-26 \cos B=5$ and $10 \cos A+13 \cos B=11$ Column I $\quad$ Column II (a) $\sin (\mathrm{A}+\mathrm{B})$ (p) $\frac{1}{65}$ (b) $\sin ^{2}\left(\frac{\mathrm{A}-\mathrm{B}}{2}\right)$ (q) $\frac{-16}{63}$ (c) $\tan (\mathrm{A}-\mathrm{B})$ (r) $\frac{65}{64}$ (d) $\sec ^{2}\left(\frac{\mathrm{A}-\mathrm{B}}{2}\right)$ (s) $\frac{56}{65}$
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