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klemol [59]
3 years ago
13

18. cos t(sec t - cos t)

Mathematics
1 answer:
Margarita [4]3 years ago
8 0
\bf sin^2(\theta)+cos^2(\theta)=1\implies sin^2(\theta)=1-cos^2(\theta)\\\\
sec(\theta)=\cfrac{1}{cos(\theta)}
\\\\
-----------------------------\\\\
cos(t)[sec(t)-cos(t)]\implies cos(t)sec(t)-cos(t)cos(t)
\\\\\\
cos(t)\cdot \cfrac{1}{cos(t)}-cos^2(t)\implies 1-cos^2(t)\implies \boxed{sin^2(t)}
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RSB [31]

The <em>correct answer</em> is:


The diagonals of the parallelogram are congruent.


Explanation:


In every parallelogram, opposite angles are congruent. This would not mean it is a rectangle.


Consecutive sides of a parallelogram are only congruent if the parallelogram is a rhombus or a square; this would not be a rectangle.


The diagonals of every parallelogram bisect each other. This would not mean it is a rectangle.


The diagonals of a rectangle bisect each other. If we know this is true about our parallelogram, this means our parallelogram is a rectangle.

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3 years ago
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Answer:

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Step-by-step explanation:

2+2+2+2+\sqrt{20\\}\\+\sqrt{20\\}\\=8+2\sqrt{20\\}\\

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h=\sqrt{20\\}\\

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3 years ago
What value of X makes the equation true -7x - (-5-x) = -9(2x-1) -1
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Answer:

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Step-by-step explanation:

-7x - (-5-x) = -9(2x-1) -1

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add 18x to each side of the equation:

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subtract 5 from each side:

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divide both sides by 12:

x = 3/12 = 1/4

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Step-by-step explanation:

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