1) tan x = 7/24. nilai dari sin (180+x) +cos(-x)adalah....... 2) nilai dari sin 150 + cos 300 / sin(-300) + tan 225 adalah.... 3) Hp persamaan 4sin x +5√3 = 3√3 untuk 0≤x≤360 adalah.....
Brillianttt
1. tan x = 7/24 = a/b jadi c = √24²+7² = 25 sin (180+x) + cos -x = -sin x + cos x = - a/c + b/c = -7/25+24/25 = 17/25 2. sin 150 + cos 300 / sin - 300 + tan 225 = sin 30 + cos 60 / sin 60 + tan 45 = 1/2 + 1/2 / 1/2 √3 +1 = 1/ (1/2 √3 +1) = -4 (1/2√3-1) = 4 - 2√3 3. 4sin x +5√3 = 3√3 4 sin x = 3√3-5√3 sin x = -2/4√3 = -1/2√3 jadi HP = {240,300}
ImmanuelSinaga
1. tan x = y/x = 7/24 y = 7 dan x = 24 ---=> dengan phytagoras r = 25 - sin x + cos x = - 7/25 + 24/25 = 17/25 2. cos 60 + cos 60/(-sin60) + tan45 1/2 + 1/2/(-1/2√3) + 1 1/(-1/2√3+ 1) 1/((2-√3)/2) rasionalkan :
3. 4 sin x = 3√3 - 5√3 sin x =(-2√3)/4 sin x = - 1/2 √3 x = 240 x = 300
sin (180+x) + cos -x = -sin x + cos x = - a/c + b/c = -7/25+24/25 = 17/25
2. sin 150 + cos 300 / sin - 300 + tan 225 = sin 30 + cos 60 / sin 60 + tan 45
= 1/2 + 1/2 / 1/2 √3 +1
= 1/ (1/2 √3 +1)
= -4 (1/2√3-1)
= 4 - 2√3
3. 4sin x +5√3 = 3√3
4 sin x = 3√3-5√3
sin x = -2/4√3 = -1/2√3
jadi HP = {240,300}
tan x = y/x = 7/24
y = 7 dan x = 24 ---=> dengan phytagoras r = 25
- sin x + cos x = - 7/25 + 24/25 = 17/25
2.
cos 60 + cos 60/(-sin60) + tan45
1/2 + 1/2/(-1/2√3) + 1
1/(-1/2√3+ 1)
1/((2-√3)/2)
rasionalkan :
3.
4 sin x = 3√3 - 5√3
sin x =(-2√3)/4
sin x = - 1/2 √3
x = 240
x = 300