2 years ago

If is an angle in quadrant II, what is the value of ?

Mathematics

1 answer:

AlekseyPX2 years ago

5 0

The value of this answer is .B

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Prove tan(x - (π / 4)) = (sin x – cos x) / (cos x + sin x) by filling in the reasons in the table below.

Mrac [35]

No way to know what reasons you're supposed to choose from...

By definition of tangent,

$\tan\left(x-\dfrac\pi4\right)=\dfrac{\sin\left(x-\frac\pi4\right)}{\cos\left(x-\frac\pi4\right)}$

The angle sum identities give

$\tan\left(x-\dfrac\pi4\right)=\dfrac{\sin x\cos\frac\pi4-\cos x\sin\frac\pi4}{\cos x\cos\frac\pi4+\sin x\sin\frac\pi4}$

$cos\dfrac\pi4=\sin\dfrac\pi4=\dfrac1{\sqrt2}$ , so we can cancel those terms to get

$\tan\left(x-\dfrac\pi4\right)=\dfrac{\sin x-\cos x}{\sin x+\cos x}$

as required.

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2 years ago

A carpenter needs to cut two pieces of trim around a window at 34 3/8 inches each. If the saw blade will remove 1/8 of an inch o

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It is so ez, it is of course 2

Step-by-step explanation:

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3 years ago

Can someone give me the answer.

AysviL [449]

Answer:

1 inch

Step-by-step explanation:

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Which of the following statements correctly compares the rate of change for the money payed, measured as

Licemer1 [7]

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7 0

2 years ago

Read 2 more answers

Find the product (2/9) x (9/5)

nevsk [136]

We can set it up like this:
$\frac{2}{9}\cdot \frac{9}{5}$
Multiply straight...
$=\frac{2\cdot \:9}{9\cdot \:5}$
Simplify...
$=\frac{2}{5}$
That's our answer, we can also convert it to decimal.

Answer in fraction form: $=\frac{2}{5}$
Answer in decimal form: $0.4$

Let me know if you have any questions regarding this problem!
Thanks!
-TetraFish

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2 years ago