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UkoKoshka [18]
3 years ago
11

I need an answer to this asap... please ....just number 3

Mathematics
2 answers:
Agata [3.3K]3 years ago
7 0

Answer:

hence cos ( 2 A ) = cos 2 A − ( 1 − cos 2 A ) = 2 cos 2 A − 1


Step-by-step explanation:Well we know that for two angles A , B

it holds that cos ( A + B ) = cos A cos B − sin A ⋅ sin B hence for A = B you get cos ( 2 A ) = cos 2 A − sin 2 A But sin 2 A = 1 − cos 2 A


SIZIF [17.4K]3 years ago
3 0

Answer:

is writing an answer


Step-by-step explanation:


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nirvana33 [79]

Answer:

5.3

Step-by-step explanation:

Use Pyth Theorem

a^2 + b^2 = c^2

6^2 + b^2 = 8^2

36 + b^2 = 64

b^2 = 28

Sq root of 28 = 5.3

4 0
2 years ago
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Troyanec [42]

Answer:

trigonometry is difficult haha….  Answer is 8.81 I think

Step-by-step explanation:

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1 year ago
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mylen [45]
That is right. Angle 2 to side 2 to angle 1 for both of them.The second triangle is just the first upside down.
3 0
3 years ago
Simplify the expression<br><br> -10r+-4r
Anna [14]
The Answer to this solution is -14r
8 0
3 years ago
A spinner has 12 equal sections:5 red 4 green and the rest are black. In 921 spins how many times can you expect to spin black?
Komok [63]

Answer:

230

Step-by-step explanation:

12 sections total

5 red, 4 green, the rest black

12-5-4 = 3 sections are black

3/12 = 1/4 of the sections are black

1/4 represents the probability of landing on black for one spin

(1/4)*921 = 230.25 which rounds to 230

We expect to land on a black section about 230 times out of 921 times total.

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3 years ago
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