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3 years ago

Awarding BRAINLIEST! Please help!!

Mathematics

2 answers:

MariettaO [177]3 years ago

8 0

The correct answer is -1/3.

Ludmilka [50]3 years ago

4 0

C. -1/3 is the answer

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3 years ago

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Prove that sinxtanx=1/cosx - cosx

maks197457 [2]

Answer:

See below

Step-by-step explanation:

We want to prove that

$\sin(x)\tan(x) = \dfrac{1}{\cos(x)} - \cos(x), \forall x \in\mathbb{R}$

Taking the RHS, note

$\dfrac{1}{\cos(x)} - \cos(x) = \dfrac{1}{\cos(x)} - \dfrac{\cos(x) \cos(x)}{\cos(x)} = \dfrac{1-\cos^2(x)}{\cos(x)}$

Remember that

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Therefore,

$\dfrac{1-\cos^2(x)}{\cos(x)} = \dfrac{\sin^2(x)}{\cos(x)} = \dfrac{\sin(x)\sin(x)}{\cos(x)}$

Once

$\dfrac{\sin(x)}{\cos(x)} = \tan(x)$

Then,

$\dfrac{\sin(x)\sin(x)}{\cos(x)} = \sin(x)\tan(x)$

Hence, it is proved

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2 years ago

How would you find the value for f(-) if you are given a graph of f(x)?

Doss [256]

Answer:

Step-by-step explanation:

multiply x as a negative.

Example:

f(x) = 3x + 1

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3 years ago

Chang bought a sofa on sale for $351. This price was 35% less than the original price.

AnnZ [28]

Answer: 473.85

Step-by-step explanation:

i found the multiplier which was( 100+35) / 100=1.35

351*1.35=473.85

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2 years ago