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3 years ago

I need to know this please help

Mathematics

2 answers:

alex41 [277]3 years ago

4 0

Take another picture too blurry

jasenka [17]3 years ago

3 0

x + 72 = 180

y = 72 (vertical angles)

x = 108

z = 90 - 72

z = 18

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option 1 drop down are: even-odd identity, quotient identity, Pythagorean identity, double-number identity.option 2 drop down ar

motikmotik

Answer:

The equation is given below as

$\frac{\cos2x}{\cos x}=\cos x-\sin x\tan x$

Step 1:

We will work on the left-hand side, we will have

$\begin{gathered} \cos x-\sin x\tan x \\ \text{recall that,} \\ Quoitent\text{ identity is} \\ \tan x=\frac{\sin x}{\cos x} \end{gathered}$

By substituting the identity above, we will have

$\begin{gathered} \cos x-\sin x\tan x=\cos x-\frac{\sin x.\sin x}{\cos x}=\cos x-\frac{\sin^2x}{\cos x} \\ \end{gathered}$

Here, we will make use of the quotient identity

Step 2:

By writings an expression, we will have

$\begin{gathered} \cos x-\sin x\tan x=\cos x-\frac{\sin x.\sin x}{\cos x} \\ \cos x-\sin x\tan x=\frac{\cos^2x-\sin^2x}{\cos x} \end{gathered}$

Here, we will use the definition of subtraction

$\cos x-\frac{\sin^2x}{\cos x}$

Step 3:

We will apply the double number identity given below

$\begin{gathered} \cos 2\theta=\cos (\theta+\theta)=\cos ^2\theta-\sin ^2\theta \\ \cos 2x=cos(x+x)=\cos ^2x-\sin ^2x \end{gathered}$

By applying this, we will have

$\frac{\cos^2x-\sin^2x}{\cos x}=\frac{\cos2x}{\cos x}$

Here, we will use the double number identity

$\frac{\cos^2x-\sin^2x}{\cos x}$

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10 months ago

Which expression represents the total perimeter of her sandwich, and if x = 1.2, what is the approximate length of the crust?

soldi70 [24.7K]

The answer to this question is choice option letter C

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3 years ago

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Aleksandr [31]

Answer:

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Step-by-step explanation:

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3 years ago

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How do I even solve this?

mixer [17]

That’s a good question

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2 years ago

At the beginning of mathematics class, Mrs. Reno gives a warm-up problem. She says, "I am think of a number such that 6 less tha

Eduardwww [97]

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2 years ago