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3 years ago

How did they get this

Mathematics

2 answers:

alexandr1967 [171]3 years ago

7 0

It's only true if x=2 and y= -1 .

katrin2010 [14]3 years ago

3 0

Somewhere in the text, it must say that x = 2 and y = -1 or else, the values just seem made up out of thin air.

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What basic trigonometric identity would you use to verify that sinx cosx tanx=1-cos^2x

andre [41]

Answer:

$sin^2x+cos^2x=1$ is used to prove the given equation.

Step-by-step explanation:

We have given an equation:

$sinx\cdot cosx\cdot tanx=1-cos^2x$

We will consider right hand side first

tan x can be written as:

$tanx=\frac{sinx}{cosx}$

So, on substituting tan x in the left hand side of the given equation we get:

$sinx\cdot cosx\cdot \frac{sinx}{cosx}$

Cancel common term from denominator and numerator which is cosx we get

$sin^2x$

And we have an identity:

$sin^2x+cos^2x=1$

$\Rightarrow sin^2x=1-cos^2x$

Hence, right hand side is equal to $sin^2x$ .

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2 years ago

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Anna [14]

${(x + 22)}^{2}$

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2 years ago

Frank is having the car pets in his house cleaned. The cost of the cleaning is calculated from the area of the carpets. C= the c

asambeis [7]

Answer:

Cost of the cleaning, C is the dependent variable

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Step-by-step explanation:

cost of the cleaning is calculated from the area of the carpets

C= the cost of the cleaning a= the area of the carpets.

Cost of the cleaning, C is the dependent variable

Area of the carpet, a is the independent variable

A dependent variable is a variable which depends on other factors to exist. They take their values based on other factors. Their value is changed as a result of a change in independent variable

An independent variable is a variable which does not change as a result of the change in other factors. They take their values irrespective of external factors around them.

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