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marusya05 [52]
2 years ago
15

In Cos A = 0.4 Find The Value Of Cos 3 A.Thenku ☃️

exFormula1" title=" \: \: " alt=" \: \: " align="absmiddle" class="latex-formula">
​
Mathematics
2 answers:
s2008m [1.1K]2 years ago
3 0
Answer:
- 0.944

Step-by-step explanation:
We know that,
cos 3A = 4 cos³A - 3 cos A (formula)

So,
If cos A = 0.4,

cos 3A = 4 cos³A - 3 cos A
cos 3A = 4 × (0.4)³ - 3 × (0.4)
cos 3A = 4 × 0.064 - 1.2
cos 3A = - 0.944


Hope it helps ⚜




kirill [66]2 years ago
3 0

Answer:

<u>Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe. The earliest roots of science can be traced to Ancient Egypt and Mesopotamia in around 3000 to 1200 BCE.</u>

Step-by-step explanation:

◖⚆‿⚆◗

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HELP?
poizon [28]
My "work" is to enter the equations into a graphing calculator and let it show me the answers--just as your "work" is to copy the question to Brainly.

The solutions are
  (x, y) = (-0.5, 7.5)
  (x, y) = (3, 25)

_____
When you equate the expressions for y, you get the quadratic
  2x² -5x -3 = 0
  (2x +1)(x -3) = 0
  x = -1/2 or 3
  y = 5(x +2) = 15/2 or 25

4 0
3 years ago
PLEASE HELP ASAP 25 PTS + BRAINLIEST TO RIGHT/BEST ANSWER
Aloiza [94]

Answer:

7 -5i

Step-by-step explanation:

The additive inverse is the number we add to make it equal to zero

-7+5i + x = 0

the real part

-7 + x = 0

x = 7

The imaginary part

5i+x = 0

x = -5i

The complex x is

7 -5i

Notice it is the opposite of the number

- (-7+5i)

7-5i

5 0
2 years ago
What is 5/20 as in a percent
Law Incorporation [45]
\sf  \dfrac{5 \div 5}{20 \div 5} =  \dfrac{1}{4}  \\  \\ 1 \div 4  \\  \\ 0.25 \\  \\ 0.25 * 100 = 25 \%
5 0
3 years ago
Read 2 more answers
What percent of 180 is 45? A. 4.5% B. 18% C. 22% D. 25%
Ber [7]

Answer:

D. 25%

Step-by-step explanation:

45/180=0.25

0.25 into a percent is 25%

6 0
3 years ago
Read 2 more answers
C) Bhurashi can do 1/3 part of a work in 6 days.
Simora [160]

Answer:

<h2>i. 18 days</h2><h2>ii.\frac{1}{18} part of work</h2><h2>iii. \frac{1}{2} part of work</h2><h2 />

Step-by-step explanation:

i.

\frac{1}{3} part of work can be done in 6 days.

Days taken to complete the whole work:

= 6 * 3

= 18 days

ii. Whole work will be done in 18 days.

So, 1 day work = \frac{1}{18}

iii. Work done in 9 days :

\frac{1}{18}  \times 9

=  \frac{1}{2}

So, remaining work :

1 -  \frac{1}{2}

=  \frac{1 \times 2 - 1}{2}

=  \frac{2 - 1}{2}

=  \frac{1}{2} part of work

Hope this helps...

Good luck on your assignment..

8 0
3 years ago
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