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EastWind [94]
3 years ago
9

How do you do this question?

Mathematics
2 answers:
katen-ka-za [31]3 years ago
7 0

Answer:

0

Step-by-step explanation:

∫ sin²(x) cos(x) dx

If u = sin(x), then du = cos(x) dx.

∫ u² du

⅓ u³ + C

⅓ sin³(x) + C

Evaluate between x=0 and x=π.

⅓ sin³(π) − ⅓ sin³(0)

0

Ilya [14]3 years ago
6 0

Answer:

\int\limits^\pi_0 {\sin^2(x)\cos(x)} \, dx=0

Step-by-step explanation:

So we have the integral:

\int\limits^\pi_0 {\sin^2(x)\cos(x)} \, dx

To evaluate this integral, we can use u-substitution. Remember that the derivative of sin(x) is cos(x). So, let u equal sin(x):

u=\sin(x)

Take the derivative of u:

\frac{du}{dx}=\cos(x)

Multiply both sides by dx:

du=\cos(x)dx

So, we can substitute cos(x) x for du.

We can also substitute sin(x) for u. Thus:

So, our integral is now:

\int\limits^\pi_0 {\sin^2(x)(\cos(x)} \, dx)\\

This is equal to:

=\int\limits^\pi_0 {u^2} \, du

However, we also must change our bounds of integration. To do so, substitute in the lower and upper bound into u. So:

u=\sin(x)\\u=\sin(0)=0

And:

u=\sin(x)\\u=\sin(\pi)=0

Therefore, our integral with our new bounds is:

=\int\limits^0_0 {u^2} \, du

Now, note that the integral has the same upper bound and lower bound. Therefore, this means that our integral is going to be 0 since with the same bounds, there will be no area.

Therefore, our answer is 0:

\int\limits^0_0 {u^2} \, du=0

And we're done!

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The sum of two integers is 26. the sum of the squares of the two integers is 340. what is the product of the two numbers?
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Lets say that the two unknown integers are n and m.

We know the following things about n and m:

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And, we want to find nm.

To solve this, we'll use the expansion of the squared of the sum of any two inegers; this is expressed as:

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We can easily solve for nm:

nm= \frac{(26)^2-340}{2}= \frac{676-340}{2}= \frac{336}{2}=168

The answer is 168.

Another approach to solve the problem is, from the two starting equations, compute the values of n and m, which are 12 and 14, and directly compute their product; however, the approach described is more elegant. 
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Step-by-step explanation:

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