3 years ago

I need help asap!!!!!

Mathematics

1 answer:

tino4ka555 [31]3 years ago

6 0

Answer:34

Step-by-step explanation:

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Complete the identity

spin [16.1K]

Answer: $cos(\pi-x)=-cos(x)$

Step-by-step explanation:

We need to apply the following identity:

$cos(A - B) = cos A*cos B + sinA*sin B$

Then, applying this, you know that for $cos(\pi-x)$ :

$cos(\pi-x)=cos(\pi)*cos(x)+sin(\pi)*sin(x)$

We need to remember that:

$cos(\pi)=-1$ and $sin(\pi)=0$

Therefore, we need to substitute these values into $cos(\pi-x)=cos(\pi)*cos(x)+sin(\pi)*sin(x)$ .

Then, you get:

$cos(\pi-x)=(-1)*cos(x)+0*sin(x)$

$cos(\pi-x)=-1cos(x)+0$

$cos(\pi-x)=-cos(x)$

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3 years ago

Evaluate u + xy, for u = 20, x = 9, and y = 8

elena-14-01-66 [18.8K]

This is how you work it out:
u + xy
Plug in your numbers that you know:
20 + 9 * 8
20 + 72
92

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3 years ago

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The rectangle is 3 3⁄4 centimeters long and 2 1⁄2 centimeters wide. What is the area of this rectangle?

Deffense [45]

Just multiply the numers given

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3 years ago

Given: ∠BCD ≅ ∠EDC and ∠BDC ≅ ∠ECD Prove: Δ BCD ≅ Δ EDC

never [62]

It would be bisecting angles

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3 years ago

Consider the line y=- 2x+7.

iVinArrow [24]

Answer:

the slope is rhe same -2

Step-by-step explanation:

the slope is the opposite +1/2

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2 years ago

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