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Alina [70]
3 years ago
9

Verify:cos(2A)=(cotA-tanA)/cscAsecA​

Mathematics
1 answer:
kolbaska11 [484]3 years ago
5 0

Answer:

see explanation

Step-by-step explanation:

Using the trigonometric identities

cot A = \frac{cosA}{sinA}, tanA = \frac{sinA}{cosA}, cscA  = \frac{1}{sinA}, secA = \frac{1}{cosA}

Consider the right side

\frac{cotA-tanA}{cscAsecA}

= \frac{\frac{cosA}{sinA}-\frac{sinA}{cosA}  }{\frac{1}{sinA}.\frac{1}{cosA}  }

= \frac{\frac{cos^2A-sin^2A}{sinAcosA} }{\frac{1}{sinAcosA} }

= \frac{cos^2A-sin^2A}{sinAcosA} × sinAcosA ( cancel sinAcosA )

= cos²A - sin²A

= cos2A

= left side ⇒ verified

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List all the factors of 19. Tell whether 19 is prime or composite.
andreyandreev [35.5K]

Answer:

19 is a prime number, thus making the only factors 1, 2, 19. (Not necessary to include 1)

Step-by-step explanation:

8 0
2 years ago
If z=3 and z*y=12 what does y+5 equal
mart [117]
Z = 3                                              (This equation is a given)

z(y) = 12                                       ( This equation is also given) 

3y = 12                                         (as z = 3, plug 3 into z)

3y/3 = 12/3                                   (isolate the y by dividing 3 to both sides) 
                                                  * you divide 3 to both sides because of the equal                                                             sign. What you do to one side you do to the                                                                    other
y = 4                                             (answer for y)

y + 5                                             (what you are solving for)

(4) + 5 = 9                                    (As y = 4, plug in 4 for y in this equation)

y + 5 = 9                                       (4 + 5 =  9, or addition property)

9 is your answer           

hope this helps
5 0
3 years ago
HELPPP PLSSSS ITS ALMOST DUE IN 1 HOUR WILL GIVE BRAINLIEST THANKS AND 5 STARSSS
svp [43]

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Step-by-step explanation:

7 0
2 years ago
Find the GCF<br> 1. 12,21,30<br> 2. 11,44
Dafna1 [17]
The GCF of 12, 21, and 30 is 3.
The factors of 12 are: 1, 2, 3, 4, 6, 12
<span>The factors of 21 are: 1, </span>3, 7, 21
<span>The factors of 30 are: 1, 2, </span>3, 5, 6, 10, 15, 30
<span>Then the greatest common factor is 3.
</span>
The GCF of 11, and 44 is 11. 
The factors of 11 are: 1, 11
The factors of 44 are: 1, 2, 4, 11, 44
Then the greatest common factor is 11. 

Hope this helps.
8 0
3 years ago
Read 2 more answers
I found the answer on multiple sites but can somebody please help me with the explanation as I did not find that anywhere.
Amanda [17]

Answer:

Explanation thing

Step-by-step explanation:

The larger the angle, the farther the opposite side is .  (For example, the angle representing Dallas shows the rank of distance from Abilene and Austin)

8 0
3 years ago
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