Variable , constant, variable
Recall that
sin²(<em>θ</em>) + cos²(<em>θ</em>) = 1
for all <em>θ</em>, and given that cos(<em>θ</em>) < 0, we find that
cos(<em>θ</em>) = -√(1 - sin²(<em>θ</em>)) = -√(1 - (2/5)²) = -√(21)/5
Now,
csc(<em>θ</em>) = 1/sin(<em>θ</em>) = 1/(2/5) = 5/2
and
cot(<em>θ</em>) = cos(<em>θ</em>)/sin(<em>θ</em>) = (-√(21)/5)/(2/5) = -√(21)/2
54981.35 is the square root
<span>y = - 5x + 1
</span>y = - 5x + 1
We can see that when x=0, y=1.
y = -5*0 + 1=1
(0,1)
Then we need try several points.
<span>(–2, 11)
</span>11=-5(-2)+1 = -11 True
(1, -4)
-4=-5*1 +1 -4 True
It looks like we have 3 points in A. So, the answer is A.
We can check other points(solutions) using the same way if we want.
