下列哪种情况只能用余弦定理
已知三角形两角一边
已知三角形两边及其夹角
已知三角形三个角
已知三角形两个边和其中一边对角
已知三角形三边
Which one is not the formula of the area of triangle:
1/2absinC
1/2acsinB
1/2bcsinB
1/2bcsinA
13+2(x+1)2
13-2(x+2)2
13-2(x+1)2
13-2(x-1)2
Express f(x)=3+12x-2x2in the form: y= a-b(x+c)2
y= 21-2(x-3)2
y= 21+2(x-3)2
y= 21-2(x+3)2
y= 21-2(x-6)2
请回答b问
4 倍根号7
7倍根号4
5倍根号7
7倍根号5
3
20
5
3/4
find the value of c
15
11
10
12
15
75
5
-15
y=6
x=6
y=-6
x=-6
该图像表达式是
y=sinx
y=2sinx
y=sin2x
y=cosx
Figure is shown y=3sinx, state the coordinates of P
(90°,3)
(180°,3)
(90°,1)
(45°,1)
y=3sinx, state the coordinates of Q
(720°,0)
(450°,0)
(360°,0)
(540°,0)
x=180°
x=270°
x=90°
x=135°
(90°,-1)
(270°,-1)
(180°,-1)
2π
1/6π
24π
2
根号3
3
Find the value of p and q
p=π/3 q=2π
p=5π/6 q=13π/6
p=5π/6 q=11π/6
p=π/3 q=4π/3
what is the vertical asymptote?
y=0
x=0
x=2
y=2
What is the coordinates of P?
(-180°,-1)
(-180°,-4)
(-90°,-1)
(-90°,-4)
请回答b问
(360°,7)
(360°,-1)
(270°,7)
(180°,-1)
(360°,1)