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3 years ago

Another question! Help if you can

Mathematics

1 answer:

ioda3 years ago

3 0

The answer is D because it can only have one symmetrical line straight down the middle.

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Find the exact value of sin –255°.

alekssr [168]

Answer:

sin(-255°) = √2 + √6/4

Step-by-step explanation:

We need to find sin -255°

We know that sin(-a) = - sin(a)

so, sin(-255°) = - sin 255°

We know that 180° + 75° = 255°

Now we can write sin(255°) = sin(180° + 75°)

We can use the identity:

sin(x+y) = sin(x) cos(y)+cos(x)sin(y)

x = 180° , y = 75°

Solving,

sin(x+y) = sin(x) cos(y)+cos(x)sin(y)

sin(180° + 75°) = sin(180°) cos(75°)+cos(180°)sin( 75°)

sin(180°) = 0

cos(75°) = √6 -√2/4

cos(180°) = -1

sin( 75°) = √2 + √6/4

Putting values,

sin(180° + 75°) = 0 (√6 -√2/4) + (-1)(√2 + √6/4)

sin(180° + 75°) = -(√2 + √6/4)

We know that sin(-255°) = -sin(255°)

Putting value of sin(255°)

sin(-255°) = -(-(√2 + √6/4))

sin(-255°) = √2 + √6/4

8 0

4 years ago

Twenty times one hundred and one (20 x 101)

Dmitrij [34]

Answer:

2020

Step-by-step explanation:

2020

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3 years ago

Consider the pattern below 5+5/3+

DedPeter [7]

Answer:

5+5/3+3/1+1

Step-by-step explanation:

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4 years ago

What is the solution to the equation -3d/d^2-2d-8+3/d-4 = -2/d+2

Keith_Richards [23]

I’m sorry if I’m not correct but I think it’s b

5 0

3 years ago

Why are exponents used in mathematics? Please help!! 10 points!!

Oksi-84 [34.3K]

Hi There!

Exponents are used in math so its easier to multiply. For example if you have to do 8 * 8 * 8 * 8 * 8 * 8 * 8 * 8, then to make it easier to multiply you could change into the exponent form $8^{8}$ that is what exponents are used for in math

Hope This Helps :)

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4 years ago