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
Mumz [18]
3 years ago
11

Find sin x if cos x= 2/3 and x is in quadrant 4

Mathematics
2 answers:
harkovskaia [24]3 years ago
8 0
Yes you'll use the half angle identities to solve...it sounds like you understand how to use them just not which sign to use.

This is actually pretty easy. All you have to do is know what quadrant your angle is in and that will determine the sign.

Quadrant1 = all trig functions are positive
Quadrant2 = sine is positive and cosine and tangent are negative
Quadrant3 = tangent is positive and sine and cosine are negative
Quadrant4 = cosine is positive and sine and tangent are negative

since your original angle is in quadrant 4 then the half angle will be in Quadrant 2

so the sine of the half angle is positive and the cosine of the half angle is negative
dangina [55]3 years ago
7 0
The sine is negative in quadrant 4

adjacent side = 2 and hypotenuse = 3 so opposite side will be -sqrt 5

so sin x = - sqrt5/ 3
You might be interested in
Find the equation of the line<br><br> y = ___x + ___
stepan [7]
Y=2/1x+3
you look at the rise over run the look at where it hits the line on the y line
5 0
3 years ago
Read 2 more answers
Which expression is equivalent to -51+ 131 ?<br> 0 -8<br> O-2<br> o 2<br> O 8
Sergio [31]

| - 5|  +   |3|

The absolute value of any number is always positive

5 + 3

Add the numbers

\sf ans = 8

<u>Thus, Last option is the correct choice!!~</u>

5 0
3 years ago
Which number line repersents the sum of 1.25+(-0.75
aleksklad [387]

Answer: See explanation

Step-by-step explanation:

You didn't give the options relating to the question.

To solve this first, you need to know that we have to note that (+) × (-) = (-). Therefore, 1.25+(-0.75) will be thesame as writing 1.25 - 0.75. This will then be:

= 1.25 - 0.75

= 0.50

3 0
3 years ago
Read 2 more answers
A pump can fill a swimming pool in 8 hours. The pool also has a drain that can empty the pool in 10 hours. If someone turns on t
cluponka [151]

Answer:

40 hours will it take for the pool to fill.

Step-by-step explanation:

A pump can fill a swimming pool in 8 hours.

Work done by pump to fill in 1 hour is  \frac{1}{8}

The pool also has a drain that can empty the pool in 10 hours.

Work done by pump to drain in 1 hour is  \frac{1}{10}

If someone turns on the pump to fill the pool, but forgets to shut the drain.

Work done by both pipe in 1 hour is

W=\frac{1}{8}-\frac{1}{10}

W=\frac{10-8}{80}

W=\frac{2}{80}

W=\frac{1}{40}

Both pipe filled \frac{1}{40} part of pool in hours = 1

Both pipe filled complete pool in hours = \frac{1}{\frac{1}{40}}=40

Therefore, 40 hours will it take for the pool to fill.

7 0
3 years ago
Your father will be going to your grandparents house for dinner.He drives 40 minutws at a constant soeed of 30 miles per houer.H
lorasvet [3.4K]

40 minutes is 2/3 of an hour.

30 miles per hour x 2/3 hour = 20 miles.

30 minutes = 1/2 hour.

60 miles per hour x 1/2 hour = 30 miles.

Total = 20 + 30 = 50 miles.

4 0
4 years ago
Other questions:
  • What is the circumference of a circle with a radius of 5.4 inches? Enter your answer as a decimal in the box. Use 3.14 for pi. R
    12·2 answers
  • 5) Write and solve an equation to find x.
    5·1 answer
  • Jared has talked out a loan for his car. His monthly payments amount to. $650. If his loan is for 36 months and he paid a down p
    5·1 answer
  • Which function is continuous at x = 18?
    9·1 answer
  • Sarah planted 68 flowers in her garden. She divided the flowers evenly among 4 rows. A week later, she planted 5 more flowers in
    11·1 answer
  • I need help and thanks
    14·1 answer
  • PLEASE HELPPP ASAPPPPP PLEASEEEEEEEEEEEE
    14·1 answer
  • Perform the indicated operation and write the result in the form a + bi i^100
    13·1 answer
  • I would like some help please
    8·1 answer
  • 5x + 10 &gt; 250 <br> can someone help me with the answer
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!