3 years ago

Which equivalent expression demonstrates the commutative property? Check all the apply.

1 answer:

8 0

Answer:

13+2+9=2+13+9

[29(14)]+45=[14(29)]+45

Step-by-step explanation:

I don't know it told me it was right

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ANSWER:⇒ ⁶¹/₂₀
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Formulate & Calculate:

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With $x(t)=\cos t$ and $y(t)=\sin t$ , we have

$z(t)=x(t)^2+4y(t)^2+1$

$z(t)=\cos^2t+4\sin^2t+1$

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Then $z(t)$ has critical points where

$\dfrac{\mathrm dz}{\mathrm dt}=6\sin t\cos t=3\sin2t=0$

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where $n$ is any integer.

$z(t)$ is increasing wherever $\sin2t>0$ , which happens for

$\dfrac{2n\pi}2$

$\boxed{n\pi$

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