1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
4vir4ik [10]
3 years ago
6

Can anyone help me with trig identities?

Mathematics
1 answer:
nevsk [136]3 years ago
6 0

Answer:

cosA = √(21/25)

Step-by-step explanation:

We know

sin²(A) + cos²(A) = 1

Next, we know that sin(A) = 2/5. Plugging that into our equation, we get

(2/5)² + cos²A = 1

4/25 + cos²A = 1

subtract 4/25 from both sides to isolate cos²A

cos²A = 1 - 4/25 = 25/25-4/25 = 21/25

square root both sides to get

cosA = √(21/25)

We do not include -√(21/25) in our possible answer for cosA because this is in quadrant 1, so cosA must be positive.

You might be interested in
What basic multiplication fact can help you divide 18÷3?
Temka [501]
D is the answer

18/3= 6

and 6*3= 18

I hope this helps!
6 0
3 years ago
Read 2 more answers
Select the pair of slopes that are the slopes of perpendicular lines
Elodia [21]

Answer:

do you have a picture

Step-by-step explanation:


6 0
3 years ago
Which of the following is the graph of (x + 1)2 + (y − 6)2 = 36?
Brrunno [24]

Answer:

Step-by-step explanation:

Slope:  

− 1

y-intercept:  

23

5 0
2 years ago
Read 2 more answers
Fond the area of the shaded sector of circle C to the nearest tenth
Lesechka [4]

Solution

Step 1

Write an expression for the area of sector

Area\text{ (A) = }\frac{\theta}{360}\times\pi\times r^2

Where

θ = 52°

π = 3.14

r = 8cm

Step 2

Find the area of the sector after substitution of values into the formula above.

\begin{gathered} A\text{ =}\frac{52}{360}\times3.14\times8^2 \\ A=29.028cm^2 \end{gathered}

To the nearest tenth the area of the shaded sector of circle C = 29.0cm²

5 0
1 year ago
The first term in a geometric sequence is 12. The common ratio is 3. Which term is 516,560,652?
STALIN [3.7K]
Its 17 th term. Hope it helps
6 0
2 years ago
Other questions:
  • Mr Leonard wants to top-up his central heating oil tank. The oil tank can take up to 1200 litres of oil. There are already 450 l
    8·1 answer
  • Please math help both please real quick , god bless
    10·1 answer
  • Marc baked brownies in the brownie pan shown below. each day, he is going to eat 202020 square centimeters of brownie from the p
    7·2 answers
  • Games are $25 each, and Caleb has $125 to spend. How many games can Caleb buy if he uses all his money?
    14·2 answers
  • 5 MINS LEFT! A group of students decides to sell pizzas to help raise money for their senior class trip. They sold a pepperoni p
    8·1 answer
  •  What is the volume of this cone?
    9·1 answer
  • If 35% of the students attended the ceremony. What fraction of the students attended the ceremony? Help, please!
    10·1 answer
  • Yoko can type 27 words in 9 minutes.<br> What is her rate in words per minute?
    7·2 answers
  • QUICK does anyone know the answer if so please tell me!!
    13·1 answer
  • Find the area of the triangle.<br><br> A. 5.7 ft<br> B. 8 ft<br> C.0.1 ft<br> D. 16 ft
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!