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Nana76 [90]
3 years ago
5

Convert this identity to one using sine term(s) only. 1-2cos(r)^2

Mathematics
1 answer:
Natali5045456 [20]3 years ago
8 0
Pythagorean identity:
sin²+cos²=1
Then cos²=1-sin²
Substitute:
1-2cos²
1-2(1-sin²)
1-2+2sin²
2sin²-1
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9 - (-2) = __ a0 <br><br> solve the equation
sergejj [24]

The answer is 11

9 - (-2)= ?

9+2 = 11

6 0
4 years ago
Plz Help Brainliest To First Answer<br><br> In rhombus ABCD , m∠BCE=33∘ .<br><br> What is m∠ABE ?
Tamiku [17]

Answer:

57 deg

Step-by-step explanation:

Rhombus ABCD has diagonals AC and BD which intersect at point E.

The diagonals of a rhombus divide the rhombus into 4 congruent triangles.

If you find the measures of the angles of one of the triangles, then you know the measures of the angles of all 4 triangles.

Also, the diagonals of a rhombus are perpendicular.

Look at triangle BCE.

m<BCE = 33

m<BEC = 90

m<BCE + m<BEC + m<CBE = 180

33 + 90 + m<CBE = 180

m<CBE = 57

<ABE in triangle ABE corresponds to <CBE in triangle BCE.

m<ABE = m<CBE = 57

Answer: 57 deg

4 0
3 years ago
Can someone pls help?
Sergio [31]
<h3>Answer:  x = 4</h3>

==================================================

Explanation:

Use the remote interior angle theorem. This says a pair of interior angles always add to the measure of the exterior angle that is not adjacent to any of the interior angles, so basically what your diagram is showing.

(interior angle C) + (interior angle D) = exterior angle

(46) + (-1+8x) = 18x+5

8x+45 = 18x+5

8x-18x = 5-45

-10x = -40

x = -40/(-10)

x = 4

5 0
3 years ago
Problem page debra finished her chemistry assignment in 15 hours. then she completed her history assignment in 34 hours. what wa
Maurinko [17]
<span>Debra spent a total of 49 hours doing these two assignments. The answer is calculated as the sum of 15 + 34 = 49.</span>
3 0
4 years ago
3x + 2y + -2x + 8y pls help
raketka [301]
<h2>Answer:</h2>

x+10y

<h3>Step-by-step explanation:</h3>

3x+2y+(-2x)+8y

First of all you cannot substitute x with y, so what u do u make the numbers with the same letters they have,and I put -2x because + &amp; - equals to -(minus) :-

3x-2x+2y+8y= x+10y

I don't add 1 to x coze when x alone stands for 1, I added +10y because both the y equations had + they were positive so I add a +.

<h3>Hope it helps </h3>
3 0
3 years ago
Read 2 more answers
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