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soal - soal tentang trigonometri mohon bantuannya ?
1. tntukan nilai x yg memenuhi persamaan: sin(x+20)=-akar 3/2 , xE [0, 2π]
2. pada jajaran genjang ABCD, diketahui panjang sisi AB = a, panjang sisi AD=b, dan besar sudut BAD= a. tunjukkan bahwa luas jajarangenjang itu sama dengan ab sin a
3. jika diketahui sin 17=a, maka nilai tan 107 sama dengan
4. buktikan identitas2 brkt.
a. 8sin^2 A+ 8cos^2 A=8
b. 4 sin^2 A=4-4 cos^2 A
2 Answers
- 9 years agoFavorite Answer
4.
a. = 8 ( sin^2 A + cos^2 A )
= 8 . 1
= 8
( Identitas trig. sin^2 A+ cos^2 A=1 )
b. = 4 sin^2 A
= 4 ( 1- cos^2 A )
= 4 - 4 cos^2 A
mngunakan dalil yg sma dgn sblmnya
2. AB = a ( alas )
AD = b ( sisi miring )
sudut BAD = A
sin A = sisi depan ( tinggi ) / sisi miring
jadi, tinggi = b Sin A
luas jajaran genjang = alas X tinggi
= a . b Sin A = ab Sin A
itu dlu yg gw bse jwb
Source(s): pikiran gw ndri - Anonymous9 years ago
4 a.. 8 sin^2 A + 8 cos^2 A = 8(sin^2 A + cos^2 A) = 8.1 = 8
