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Nookie1986 [14]
11 months ago
12

s 1 05 1 -1.5 -05 0.5 1 -0.5 -1.5 If the cosine of in this unit circle is a, what would be true of the cosine of in a circle wit

h a radius of 2?
Mathematics
1 answer:
viva [34]11 months ago
7 0

In the unit circle

\cos ^2x+\sin ^2x=1x^2+y^2=r^2

Where r is the radius of the circle

x- coordinate represents cos angle

cos angle = x/r

Since r = 2

cos angle = x/2

y-coordinate represents sin angle

sin angle = y/r

sin angle = y/2

Because the question is incomplete

we can not find which is true

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rewona [7]
Solve the following system:{-9 x = 5 - 2 y | (equation 1)15 x = 2 y - 11 | (equation 2)
Express the system in standard form:{-(9 x) + 2 y = 5 | (equation 1)15 x - 2 y = -11 | (equation 2)
Swap equation 1 with equation 2:{15 x - 2 y = -11 | (equation 1)-(9 x) + 2 y = 5 | (equation 2)
Add 3/5 × (equation 1) to equation 2:{15 x - 2 y = -11 | (equation 1)0 x+(4 y)/5 = (-8)/5 | (equation 2)
Multiply equation 2 by 5/4:{15 x - 2 y = -11 | (equation 1)0 x+y = -2 | (equation 2)
Add 2 × (equation 2) to equation 1:{15 x+0 y = -15 | (equation 1)0 x+y = -2 | (equation 2)
Divide equation 1 by 15:{x+0 y = -1 | (equation 1)0 x+y = -2 | (equation 2)
Collect results:Answer:  {x = -1                {y = -2

Please note the { are supposed to span over both equations but it interfaces doesn't allow it. Please see attachment for clarification.

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