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ZanzabumX [31]
3 years ago
8

Prove the following relations:cot²a-cos²a=cot²a cosplease help:((​

Mathematics
1 answer:
Mademuasel [1]3 years ago
4 0

Answer:

steps below

Step-by-step explanation:

It's easier to prove from right side to left side. If you insist to prove from left to right, you can just reverse the calculation from bottom to the top.

cot^{2} a * cos^{2}a \\= cot^{2} a * (1-sin^{2} a)\\= cot^{2} a - cot^{2} a*sin^{2} a\\= cot^{2} a - \frac{cos^{2} a}{sin^{2}a} *sin^{2} a\\= cot^{2} a - cos^{2} a

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Fill in the blank. Given O below, you can conclude that OD is congruent to ___________.
Debora [2.8K]

The circle with center O has two chords AC and EF which are of same length 9.07.

OD and OB are the two perpendiculars drawn from the center O to the two chords AC and EF .It represents the distance of the chords from the centre.

The circle theorem states: congruent chords are equidistant from the center.

OD is congruent to OB.

Option A is the right answer.

4 0
3 years ago
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Determine the solution set for the inequality statement? + 4 < 9 y > -10 y < -10 y > - 5/2 y < - 5/2
Igoryamba

Answer:

Sorry im not sure on this one...

Step-by-step explanation:

4 0
3 years ago
Fins the value of (15)^3 + (-9)^3 + (-6)^3 , without actually cubing the numbers​
Hatshy [7]

a³ + b³ + c³ + 3abc = ( a + b + c)(a² + b² + c² + ab + bc + ca)

if a + b + c = 0. then a³ + b³ + c³ = 3abc

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a + b + c = 15 - 15

a + b + c = 0

so a³ + b³ + c³ = 3abc

15³ + (-9)³ + (-6)³ = 3(15)(-9)(-6)

= 2430

so the answer is 2430

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3 years ago
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GuDViN [60]
Multiply by two
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3 years ago
Solve for x in the picture below. Thanks! Will give brainliest.
Nonamiya [84]

Answer:

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72°+2x=90°

2x=90°-72

2x=18

x=18/2

x=9

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2 years ago
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