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2 years ago

The value of sin^2 30° - cos^2 30° is

Mathematics

2 answers:

natulia [17]2 years ago

7 0

Answer:

-1/2

Step-by-step explanation:

Im not going to go into detail about how to compute sin30 and cos 30, but know that sine and cosine are just the ratios between the sides of a 30-60-90 triangle with a hypothenuse of 1.

With that being said:

sin^2 30 - cos^2 30

= (1/2)^2 - ((sqrt3)/2)^2

= 1/4 - 3/4

= -1/2

Ber [7]2 years ago

7 0

Answer:

-1/2

Step-by-step explanation:

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If y = 124 and x = 12, find y when x = -24.

tatyana61 [14]

Answer:

y = -248

Step-by-step explanation:

Hi there!

Set up a proportion:

$\displaystyle\frac{124}{12} =\frac{y}{-24}$

Cross-multiply:

$12y=(-24)(124)\\12y=-2976\\y=-248$

I hope this helps!

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2 years ago

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wolverine [178]

Answer:

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Step-by-step explanation:

Given that,

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2 years ago

Writing equations in standard form:

d1i1m1o1n [39]

You have already done half of it. Now substitute for x1 = 4 and y = 5
y - 5 = 6/7(x - 4)
Multiply everything by 7 to remove fractions
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Some people prefer a positive number in front of x so multiply by -1
6x - 7y = -11

You can check the answer by testing it works for both of the original points
6x4 - 7x5 = 24 - 35 = -11 true
6x-3 - 7x-1 = -18 - -7 = -11 true

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1 year ago

The value of sin^2 30° - cos^2 30° is​

The value of sin^2 30° - cos^2 30° is