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Len [333]
4 years ago
11

How do I integrate trig functions

Mathematics
1 answer:
katrin [286]4 years ago
7 0
Integrate sin(3x+1) with respect to x.  Use the substitution method.  Let u=3x+1 be y our substitution.  Then du/dx = 3, and du = 3dx.

Then we have "integrate sin u with respect to u" .  Here's where things are just a bit tricky at first.  You have "integrate sin (3x+1) with respect to x."  If u = 3x+1, then du/dx = 3 and du=3dx.   But we don't have 3dx; we have only dx.  Manipulate du=3dx as follows:  du/3 = dx.

Then, "integral of sin (3x+1) dx"  => "integral of sin u (du/3)"

and this is equivalent to   (1/3) "integral of sin u du."  We get:
(1/3)(-cos u) + c, or (-1/3)*cos u + c.  Finally, subst. 3x+1 for du, obtaining

(-1/3)*cos(3x+1) + C (answer).

You should find the derivative of this as a check.  If the result of your differentiation is sin(3x+1), your integral was correct.  Otherwise, it's not.

Don't worry... this material becomes much easier once you've gotten the knack of it.
 
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Using the distance formula , find the distance from the center of your habitat to the point (x, y). Write this equation. Your an
alexdok [17]

Answer:

See explanation

Step-by-step explanation:

The distance formula is given by:

d =  \sqrt{ {(x_2-x_1)}^{2} +  {(y_2-y_1)}^{2}  }

We want to find the distance between (a,b) and (x,y).

The center of the habitat is missing in the question.

Assuming the center is (a,b) where a and b are real numbers, then we can use the distance formula to obtain:

d = \sqrt{(x - a)^{2} +  {(y - b)}^{2}  }

For instance if the center of your habitat us (2,-1), then

d = \sqrt{(x - 2)^{2} +  {(y  + 1)}^{2}  }

6 0
3 years ago
Please answer this question now
lidiya [134]

Answer:

C = (2,2)

Step-by-step explanation:

B = (10 ; 2)

M = (6 ; 2)

C = (x ; y )

|___________|___________|

B (10;2)            M (6;2)             C ( x; y)

So:

dBM = dMC

√[(2-2)^2 + (6-10)^2] = √[(y-2)^2 + (x - 6)^2]

(2-2)^2 - (6-10)^2 = (y-2)^2 + (x - 6)^2

0 + (-4)^2 = (y-2)^2 + (x - 6)^2

16 = (y-2)^2 + (x - 6)^2

16 - (x - 6)^2 = (y-2)^2

Also:

2*dBM = dBC

2*√[(2-2)^2 + (6-10)^2] = √[(y-2)^2 + (x - 10)^2]

4*[(0)^2 + (-4)^2] = (y-2)^2 + (x - 10)^2

4*(16) = (y-2)^2 + (x - 10)^2

64 = (y-2)^2 + (x - 10)^2

64 = 16 - (x - 6)^2 + (x - 10)^2

48 = (x - 10)^2 - (x - 6)^2

48 = x^2 - 20*x + 100 - x^2 + 12*x - 36

48 = - 20*x + 100 + 12*x - 36

8*x = 16

x = 2

Thus:

16 - (x - 6)^2 = (y-2)^2

16 - (2 - 6)^2 = (y-2)^2

16 - (-4)^2 = (y-2)^2

16 - 16 = (y-2)^2

0 =  (y-2)^2

0 = y - 2

2 = y

⇒ C = (2,2)

4 0
3 years ago
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ololo11 [35]

Answer:

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Step-by-step explanation:

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7 0
3 years ago
A craft store buys 50 yards of satin ribon for $12.50. The store sells the ribbon by the foot. A customer can purchase 5 feet of
amm1812

Answer:

$8.1

Step-by-step explanation:

Convert 45 yards of ribbon to feet through proper conversion factor.  

  (45 yards)(3 ft / 1 yard) = 135 feet

Divide this number by 5 to determine the number of 5-ft ribbon that customers can purchased.

    n = 135 ft / 5 ft = 27

Then, multiply by $0.80.

   R = (27)($0.80) = $21.6

The profit is equal to $21.6 and $13.50,

    P = $21.6 - $13.50 = $8.1

Answer: $8.1

8 0
3 years ago
Round 75.4614 to the nearest thousandth
Anna11 [10]
75.4614\approx75.461
6 0
3 years ago
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