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Gekata [30.6K]
3 years ago
11

What expression is equal to COS B????

Mathematics
1 answer:
Murrr4er [49]3 years ago
3 0

Answer:

A/C

Step-by-step explanation:

Since the sum of the angles in a triangle equals 180°, and angle C is 90°.

That means angles A and B add up to 90°, that is, they are complementary angles. Therefore the cosine of B equals the sine of A.

We saw on the last page that sin A was the opposite side over the hypotenuse, that is, a/c. Hence, cos B equals a/c.

Your welcome! :)

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Answer:

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e. not closed under addition but closed under multiplication

Step-by-step explanation:

a.

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Therefore, A is closed under addition and multiplication.

b.

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Let x,y∈A such that x=2m+1\,,\,y=2n+1 where m, n ∈ Z.

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x+y ∉ A

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c.

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d.

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Let x,y ∈ A such that x=17n,y=17m

Find x + y and xy

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x+y,xy ∈ A

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e.

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Find x + y

x+y=-1+1=0

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x+y ∈ A

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Therefore, A is not closed under addition but A is closed under multiplication.

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