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andrey2020 [161]
3 years ago
15

Cos square 30 degree minus sin square 30 degree is equals to 1 minus 2 sin square 30 degree​

Mathematics
1 answer:
babunello [35]3 years ago
4 0

Answer:

see explanation

Step-by-step explanation:

Not sure quite what you are asking, but

Using the trigonometric identity

cos² x = 1 - sin²x, then

cos²x - sin²x

= 1 - sin²x - sin²x

= 1 - 2sin²x

Thus

cos²30° - sin²30° = 1 - 2sin²30°

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weeeeeb [17]

Answer:

Solution given:

The area of a circle =80.86cm²

we have:

The area of a circle =πr²

substituting value of area of circle we get

80.86cm=3.14*r²

dividing both side by 3.14

80.86/3.14=3.14*r²/3.14

25.75=r²

doing square root on both side

\sqrt{25.75}=\sqrt{r²}

r=5.07cm

<u>The</u><u> </u><u>length</u><u> </u><u>of</u><u> </u><u>radius</u><u> </u><u>is</u><u> </u><u>5</u><u>.</u><u>0</u><u>7</u><u>cm</u>

5 0
2 years ago
Can someone please help me with #2?​
Norma-Jean [14]

For problem 2, you are correct in stating that a curve forms. Specifically, if we were to trace along the outer edge of the shape, then we'd form a <u>parabola</u> that has been tilted 45 degrees compared to the more familiar form that students are taught (where the axis of symmetry is vertical).

For more information, search out "Tangent method for parabolas". As the name implies, the tangent method draws out the tangents of the parabola which helps form the parabola itself.

Everything else on your paper is correct. You have problem 1 correct, and the table is filled out perfectly. Nice work.

4 0
2 years ago
A rectangular park has an area of 64 square yards. If we multiply its length and width by 12, what will be the area of the new r
erma4kov [3.2K]
The area of the rectangle would be 768
7 0
3 years ago
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sergij07 [2.7K]

Answer:

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Step-by-step explanation:

36x^3 - 96x^2 + 48x

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C. Wich mean she worked 5 hours and half an hour (0.5)
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