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3 years ago

NO LINKS OR ELSE YOU'LL BE REPORTED! Only answer if you're very good at Math.Don't guess please.

1 answer:

6 0

Answer:

the answer is A........

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bulgar [2K]

Apply the rules of sum/difference for trigonometric functions:

$\sin(x+y) = \sin(x) \cos(y) + \cos(x) \sin(y)$

$\cos(x-y) = \sin(x) \sin(y) + \cos(x) \cos(y)$

Multiply the two expressions:

$(\sin(x) \cos(y) + \cos(x) \sin(y)) (\sin(x) \sin(y) + \cos(x) \cos(y)) =$

$\sin(x) \cos(y)\sin(x) \sin(y) + \sin(x) \cos(y)\cos(x) \cos(y) + \cos(x) \sin(y)\sin(x) \sin(y) + \cos(x) \sin(y)\cos(x) \cos(y) =$

$\sin^2(x) \cos(y)\sin(y) + \sin(x) \cos^2(y)\cos(x)+ \cos(x) \sin^2(y)\sin(x) + \cos^2(x) \sin(y)\cos(y)$

You can factor $\cos(y)\sin(y)$ from the first and last term, and $\sin(x)\cos(x)$ from the two middle terms: you have

$\cos(y)\sin(y)(\sin^2(x)+\cos^2(x)) + \sin(x) \cos(x)(\cos^2(y)+\sin^2(y))$

Since $\sin^2(x)+\cos^2(x)=1$ , the identity is proven.

5 0

4 years ago

maria [59]

This needs more information

4 0

3 years ago

vitfil [10]

Answer: X

Step-by-step explanation: The Square root of 68 is 8.246, meaning the closest point to that number is X.

5 0

3 years ago

lubasha [3.4K]

Answer:4.265

Step-by-step explanation:

Can it be decimal?

3 0

3 years ago

andrew11 [14]

Answer:

I don't no the answer i hope you

7 0

3 years ago