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ivann1987 [24]
3 years ago
12

D/dx [tan^-1 (x)] find the derivative

Mathematics
1 answer:
Eva8 [605]3 years ago
7 0
From my notes I’ve the derivative of arctan(x)= 1/(1+x^2)
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Equations practice with angles Geometry. Can anyone help me please, im stuck....​
Bas_tet [7]

Same as the last one ! Review your parallel lines, and you'll see that angles A and B have to be equal. So you solve it EXACTLY the same way as the last one.

You say "A equals B", and that means that

8x - 10 = 3x + 90

Solve that to find x (it's 20),

and then use x to find angle B (it's 150; they both are).

(Don't just take my word for it. Please work it through.)

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3 years ago
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jeka57 [31]

Answer:

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Step-by-step explanation:

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I do not understand question 6
Leokris [45]

9514 1404 393

Answer:

  28

Step-by-step explanation:

The diagonals of the parallelogram are AC and BD. The way the diagram is drawn, BD is the long diagonal, said to be 24 inches. AC is the short diagonal, said to be 12 inches.

Since AC bisects BD at point E, point E is the midpoint of BD. That means BE = (24 inches)/2 = 12 inches.

Since BD bisects AC at point E, point E is the midpoint of AC. That means EC = (12 inches)/2 = 6 inches.

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Now, we know the lengths of the sides of ΔBEC, so we can find its perimeter. The perimeter of any geometry is the sum of the lengths of its sides.

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The perimeter of triangle BEC is 28 inches.

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