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Brilliant_brown [7]
3 years ago
5

Which expression is equivalent to (sin x + 1)(sin x − 1)?

Mathematics
1 answer:
pogonyaev3 years ago
4 0

Answer:

Keep in Mind the trigonometric Identity to solve the problem

sin²x+cos²x=1

cos²x= 1 - sin²x

Now, (Sin x -1)× (Sin x +1)

= (Sin²x-1²)→→→Used the Identity, (a-b)(a+b)=(a²-b²)

= Sin²x-1

= - (1-sin²x)

= -Cos²x

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When 60% of a number is added to the number, the result is 192
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Answer:

the number (x) is 120.

Explanation:

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<em />

<em>(just multiply it by 1.6 because it is equal to 60%)</em>

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Kory calculated several numbers in his calculator. The result displayed 1.3E-2 on the calculator screen. Which equivalent number
frosja888 [35]

Answer:

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Step-by-step explanation:

Many calculators use "E" to signify "×10^( )". Thus ...

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The length of a rectangular deck is five times it's width if the decks perimeter is 24 feet what is the decks area
miv72 [106K]

Answer:

20 square feet

Step-by-step explanation:

The length of a rectangular deck is five times it's width if the decks perimeter is 24 feet what is the decks area

Step 1

We find the Length and Width of the deck

Perimeter of a rectangle = 2L + 2W

The length of a rectangular deck is five times it's width

W = Width

L = Length = 5W

P = 24 feet

Perimeter = 2(5W) + 2W

24 = 10W + 2W

24 = 12 W

W = 24/12

W = 2 feet

Solving for L

L = 5W

L = 5 × 2 feet

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Step 2

We find the area of the deck

Area of the deck(Rectangle) = Length × Width

= 10 feet × 2 feet

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Answer:

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Step-by-step explanation:

Cross multiply

4/1 * 3/4

4 * 4 = 16

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6 0
3 years ago
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