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I am Lyosha [343]
3 years ago
12

Write an equation for the line perpendicular to 4x - 12y = 2 and passing through point (10, -1)

Mathematics
1 answer:
MrMuchimi3 years ago
8 0

Answer:

3x+y=-31

Step-by-step explanation:

4x - 12y = 2\\12y = 4x-2\\y=\frac{x}{3}-\frac{1}{6}

Slope of perpendicular line is -3.

y=-3x+b

Sub in the point (10, -1)

-1=-3(10)+b\\-1=30+b\\b=-31\\y=-3x-31\\3x+y=-31

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3 years ago
CosA.cos2A.cos4A=sin8A/8sinA​
alexgriva [62]

I assume you're supposed to establish the identity,

cos(A) cos(2A) cos(4A) = 1/8 sin(8A) / sin(A)

Recall the double angle identity for sine:

sin(2<em>x</em>) = 2 sin(<em>x</em>) cos(<em>x</em>)

Then you have

sin(8A) = 2 sin(4A) cos(4A)

sin(8A) = 4 sin(2A) cos(2A) cos(4A)

sin(8A) = 8 sin(A) cos(A) cos(2A) cos(4A)

==>   sin(8A)/(8 sin(A)) = cos(A) cos(2A) cos(4A)

as required.

3 0
3 years ago
The sum of the measures of the angles of a triangle is 180 degrees. angels A,B,C has ratios of 3:5:7. What are their measures ?
Igoryamba

Answer:

<em>36:60:84</em>

<em>A     : B    : C</em>

<em>36° : 60° : 84°</em>

<em>A= 36°</em>

<em>B= 60°</em>

<em>C=84°</em>

Step-by-step explanation:

<em>3:5:7 =15</em>

<em>180÷15=12</em>

<em>3×12=36</em>

<em>36:x:y =180</em>

<em>5×12=60</em>

<em>36:60:y =180</em>

<em>7×12=84</em>

<em>36:60:84 =180</em>

4 0
1 year ago
Read 2 more answers
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