Answer:
no
Step-by-step explanation:
yes
Let
be the larger number and
the smaller number.
The first sentence translates to
. The second translates to
.
Since
, you can substitute this into the second equation to get
Then substituting this into the original second equation gives
Answer:
cos2θ = -0.7041
Cos θ = -0.3847
Step-by-step explanation:
Firstly, we should understand that since θ is in quadrant 2, the value of our cosine will be negative. Only the sine is positive in quadrant 2.
Now the sine of an angle refers to the ratio of the opposite to the adjacent. And since there are three sides to a triangle, we need to find the third side which is the adjacent so that we will be able to evaluate the cosine of the angle.
What to use here is the Pythagoras’ theorem which states that the square of the hypotenuse is equal to the sum of the squares of the adjacent and the opposite.
Since Sine = opposite/hypotenuse, this means that the opposite is 12 and the hypnotist 13
Thus the adjacent let’s say d can be calculated as follows
13^2 = 12^2 + d^2
169 = 144 + d^2
d^2 = 169-144
d^2 = 25
d = √25 = ±5
Since we are on the second quadrant, the value of our adjacent is -5 since the x-coordinate on the second quadrant is negative.(negative x - axis)
The value of cos θ = Adjacent/hypotenuse = -5/13
Cos θ = -5/13
Cos θ = -0.3846
Using trigonometric formulas;
Cos 2θ = cos (θ + θ) = cos θ cos θ - sin θ sin
θ = cos^2 θ - sin^2 θ
Cos 2θ = (-5/13)^2 - (12/13)^2
Cos 2θ = 25/169 - 144/169
Cos 2θ = (25-144)/169 = -119/169
Cos 2θ = -0.7041
Answer:
x=40/9
Step-by-step explanation:
(2/5)*x-((5/8)*x)-15+16=0
(2/5)*x+(-5/8)*x-15+16=0
1-9/40*x=0 // -1
-9/40*x=-1// : -9/40
x= -1/(-9/40)
x=40/9
x=40/9
Answer:
Step-by-step explanation:
This is simplest if we subtract the area of the missing rectangle from the area of a complete rectangle.
A=9(3+6+3)-2(6)
A=9(12)-12
A=108-12
A=96 cm^2
