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3 years ago

100 POINTS!!! can someone please explain how to do this?

Mathematics

2 answers:

ivolga24 [154]3 years ago

7 0

Answer:

x =pi/2,3pi/2

Step-by-step explanation:

sin²(x) - cos²(x) - sin²(x) = 0

Simplify

sin²(x) - sin²(x) = 0

Leaving us with

- cos²(x) = 0

Divide each side by -1

- cos²(x/-1 = 0/-1

cos²(x) = 0

Take the square root of each side

sqrt( cos²(x)) = sqrt(0)

cos(x) = 0

Taking the inverse cos of each side

cos^-1(cos(x)) = cos^-1(0)

x = pi/2 x = 3pi/2

aleksklad [387]3 years ago

3 0

Answer:

x = π/2, 3π/2

Step-by-step explanation:

sin²(x) - cos²(x) - sin²(x) = 0

-cos²(x) = 0

cos²(x) = 0

cos(x) = 0

x = π/2, 3π/2

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Simplify √20 x √ 43 x √18

Alecsey [184]

Answer: $6\sqrt{430}$

Explanation:

$\sqrt{20}\sqrt{43} \sqrt{18}=\sqrt{2^25\cdot43\cdot3^22}=6\sqrt{430}$

5 0

3 years ago

What is: 45 + 22 ÷ 11 • {[(60 – 15) • 60] + 25}? ( I really don't have a clue :/ )

Luden [163]

Answer:

the answer is 5495

Step-by-step explanation:

1. subtract the numbers

2.multiply the numbers

3.add the numbers

4.use the rule of multiplication and division

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8 0

3 years ago

I need someone to show the work and explain how to do it. Thanks

lesantik [10]

Answer:

Per tier is 3

Step-by-step explanation:

5-2x=-4x+9

Since each side is same

5=-2x+9

-2x+4=0

2x=4

x=2

And 5-4 is 1

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7 0

3 years ago

On Monday, the Dairy Barn sold 14 waffle cones for every 6 sugar cones. On Tuesday, the Dairy Barn sold 7 waffle cones for every

dimulka [17.4K]

Answer:

Option b

Step-by-step explanation:

To represent this proportion using fractions, let the numerators be the number of waffles sold and denominator, the number of sugar cones.

Thus, the proportion that can be used to represent the cone sales is

14/6 = 7/3

3 0

3 years ago

Read 2 more answers

Simplify (8^2/3)^4 Plzzzzz helppppppppp

sveticcg [70]

Hi,

Answer: 207126.1235

My work: You can easily achieve this problem with a caulator by taking your numbers in the parentheses, because parentheses always goes first. When you do this you get the answer 21.33333333. The next step would be to take this value and square it by four whic gets your answer 207126.1235.

My Numerical work:

1. (8^2/3) = 64/3 = 21.33333333

Step 2 Square answer by 4:

2. 21.33333333^4 = 207126.1235

Your final answer would be:

207126.1235

I Hope I Helped!

8 0

4 years ago