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Natali [406]
3 years ago
10

Plz help me quick!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Mathematics
1 answer:
ANEK [815]3 years ago
3 0

Answer: 135

Step-by-step explanation:

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Based on Pythagorean identities, which equation is true? A. Sin^2 theta -1= cos^2 theta B. Sec^2 theta-tan^2 theta= -1 C. -cos^2
Arturiano [62]

Answer:

D

Step-by-step explanation:

our basic Pythagorean identity is cos²(x) + sin²(x) = 1

we can derive the 2 other using the listed above.

1. (cos²(x) + sin²(x))/cos²(x) = 1/cos²(x)

1 + tan²(x) = sec²(x)

2.(cos²(x) + sin²(x))/sin²(x) = 1/sin²(x)

cot²(x) + 1 = csc²(x)

A. sin^2 theta -1= cos^2 theta

this is false

cos²(x) + sin²(x) = 1

isolating cos²(x)

cos²(x) = 1-sin²(x), not equal to sin²(x)-1

B. Sec^2 theta-tan^2 theta= -1

1 + tan²(x) = sec²(x)

sec²(x)-tan(x) = 1, not -1

false

C. -cos^2 theta-1= sin^2

cos²(x) + sin²(x) = 1

sin²(x) = 1-cos²(x), our 1 is positive not negative, so false

D. Cot^2 theta - csc^2 theta=-1

cot²(x) + 1 = csc²(x)

isolating 1

1 = csc²(x) - cot²(x)

multiplying both sides by -1

-1 = cot²(x) - csc²(x)

TRUE

3 0
3 years ago
Simplify and show work <br><br> 5x - (6 - x)
Scilla [17]

Answer:

6x-6

Step-by-step explanation:

5x-(6-x)

First you distribute the negative to (6-x) which makes -6+x, then you just subtract that from 5x which makes 5x-6+x then you just simplify into 6x-6.

4 0
3 years ago
A=-13y solve for y <br> This is all the question says so idk
Inessa05 [86]
I think that y=-1/13x
3 0
3 years ago
Could someone please help me?
elena-14-01-66 [18.8K]

Answer:

(-6,0),(-5,-1),(-1,-2)

6 0
3 years ago
A model rocket is 3 inches long. the real rocket is 120 ft long. what is the unit rate that describes the relationship of the re
lora16 [44]

Answer:

40 ft/in

Step-by-step explanation:

There is 40 feet for every inch of the model

4 0
3 years ago
Read 2 more answers
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