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
Nikolay [14]
3 years ago
11

If sin 42° =2/3, then cos 48°=

Mathematics
2 answers:
Delvig [45]3 years ago
7 0
Sinα=cos(90-α)  is a basic identity.

if sin42=2/3 then cos(90-42)=2/3 as well  (90-42=48)
borishaifa [10]3 years ago
5 0
We know that:  sin Ф = cos(π/2 - Ф) ↔ sin Ф = cos(90° - Ф)
Then:

sin 42° = cos(90° - 42°) = cos 48°

IF sin 42° = 2/3, the cos 48° = 2/3
You might be interested in
Stephanie saw an ad in the paper that her favorite kind of perfume was on sale for 25% off. Her favorite perfume costs $20 per b
Natalija [7]

Answer:

$5

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
What is x (its a parralleligram)
creativ13 [48]

Check the picture below.

7 0
3 years ago
Question 2 plz help I’ll try my best to mark brainliest
Zina [86]

Answer:

F. \sqrt{x}

Step-by-step explanation:

if you replace x with 2 and plug these into your calculator, you can see that \sqrt{x} has the least value

3 0
3 years ago
Use the given information to find the exact value of the expression. sin α = 2129 21 29 , α lies in quadrant II, and cos β = 151
beks73 [17]
The correct question is
Use the given information to find the exact value of the expression. sin α = 21/29, α lies in quadrant II, and cos β = 15/17, β lies in quadrant I Find sin (α - β).

we know that
sin(α − β<span>) = </span>sin α cos β − cos α sin β

α lies in quadrant II
so
cos α  is negative
sin α  is positive

β lies in quadrant I
so
cos β  is positive
sin β   is positive

step 1
find sin β
cos β=15/17
sin² β+cos² β=1-----------> sin² β=1-cos² β----> sin² β=1-(15/17)²
sin² β=1-225/289-----> 64/289
sin β=8/17

step 2
find cos α
sin α = 21/29
cos² α + sin² α=1----> cos² α=1-sin² α---> cos² α=1-(21/29)²---> 1-441/841
cos² α=400/841------> cos α=-20/29  (remember cos α is negative)

step 3
find sin(α − β) 
sin α = 21/29   cos α=-20/29
sin β=8/17       cos β=15/17

sin(α − β) = [21/29]*[15/17] − [-20/29*]*[8/17]
sin(α − β) = [315/493] − [-160/493]
sin(α − β) = 475/493

the answer is
sin(α − β) = 475/493


3 0
4 years ago
May somebody help me please
nikdorinn [45]
Here how I did it and the answer is -6

4 0
3 years ago
Other questions:
  • HELP ME ITS DUE TODAY
    10·2 answers
  • Rita ate 1 6 of a pizza. Sara ate 2 6 of the pizza and Tony ate 1 6 of the pizza. How much of the pizza did the three students e
    13·2 answers
  • Build a triangle is it possible to build 5,5,3
    7·1 answer
  • What is the slope of a line parallel to the line whose equation is 6x - y = 1. Fully
    10·2 answers
  • Geometry math question no Guessing and Please show work
    10·1 answer
  • I need help with this question. It is due tomorrow. #10. 35 points.
    8·1 answer
  • What is 619,493 in expanded form
    13·2 answers
  • With words, we might say: "After 7.5 seconds, Cannon Man was 6.15 feet off the ground."
    6·1 answer
  • What is the remainder when 42,325 ÷ 47?
    8·2 answers
  • 9029<br> 2066<br> 10<br> 4<br> -6-54-3-2-12- 2 3 4 5 6 x<br> -f(x)<br> -6<br> -8<br> -10<br> -12+
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!