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
Burka [1]
3 years ago
7

The value of sin^2 30° - cos^2 30° is​

Mathematics
2 answers:
natulia [17]3 years ago
7 0

Answer:

-1/2

Step-by-step explanation:

Im not going to go into detail about how to compute sin30 and cos 30, but know that sine and cosine are just the ratios between the sides of a 30-60-90 triangle with a hypothenuse of 1.

With that being said:

sin^2 30 - cos^2 30

=  (1/2)^2 - ((sqrt3)/2)^2

= 1/4 - 3/4

= -1/2

Ber [7]3 years ago
7 0

Answer:

-1/2

Step-by-step explanation:

You might be interested in
1.What basic trigonometric identity would you use to verify that cot x sin x = cos x? . .
zavuch27 [327]
1 ) cot x * sin x = cos x
(cos x / sin x) * sin x = cos x 
cos x = cos x
Answer: B ) cot x = cos x / sin x
2 ) ( sin² x + cos² x ) / cos x = sec x
1/cos x = sec x
sec x = sec x
Answer: C ) cos² x + sin² x = 1
3 0
3 years ago
I need help with this problem too
liq [111]
132 drinks were in stock initially
8 0
3 years ago
Read 2 more answers
On Monday, Elsbeth’s bank account balance was -$16.75. On Tuesday, she deposited a check for $5.72. On Thursday, she deposited $
koban [17]

Answer:

5.72

Step-by-step explanation:

(-16.75 + 16.75) = 0

0 + 5.72= 5.72

Therefore, the answer is 5.72

4 0
3 years ago
The radius of a right circular cone is increasing at a rate of 4 inches per second and its height is decreasing at a rate of 5 i
solmaris [256]

Answer:

V' = 900\pi in^{3} /sec

Step-by-step explanation:

V = \frac{1}{3} \pi r^{2}h

V' = \frac{2\pi rh *r'}{3}  + \frac{\pi r^{2} *h'}{3} (using differentiation product rule)

plug known values in for r, h, r', and h'

V' = \frac{2\pi (10)(40)(4)}{3} + \frac{\pi (10^{2} )(-5)}{3}

V' = \frac{3200\pi }{3} - \frac{500\pi }{3} \\V' = \frac{2700\pi }{3} \\

V' = 900\pi in^{3} /sec

3 0
3 years ago
What is the GCF of 81 and 36?<br> What is the LCM of 4 and 9?
Mila [183]
The question "What is the LCM and GCF of 36 and 81?" can be split into two questions: "What is the LCM of 36 and 81?" and "What is the GCF of 36 and 81?"

In the question "What is the LCM and GCF of 36 and 81?", LCM is the abbreviation of Least Common Multiple and GCF is the abbreviation of Greatest Common Factor.

To find the LCM, we first list the multiples of 36 and 81 and then we find the smallest multiple they have in common. To find the multiples of any number, you simply multiply the number by 1, then by 2, then by 3 and so on. Here is the beginning list of multiples of 36 and 81:

Multiples of 36: 36, 72, 108, 144, 180, 216, etc.

Multiples of 81: 81, 162, 243, 324, 405, 486, etc.

The least multiple on the two lists that they have in common is the LCM of 36 and 81. Therefore, the LCM of 36 and 81 is 324.
4 0
3 years ago
Other questions:
  • What is the solution to (2 - 1)(4 - 2) + 9?​
    10·2 answers
  • A university offers a Calculus class, a Sociology class, and a Spanish class. Youare given data below about a group of students
    5·1 answer
  • 20=2(r+7)<br> I need help with this equation
    13·2 answers
  • HELP PLSSS HURRY PLS
    15·1 answer
  • If someone could help me figure out #7 ASAP I’d really appreciate it
    14·1 answer
  • Cab someone help me finish this question on my hw please
    7·1 answer
  • I need help on this too please it’s hard
    11·2 answers
  • Patel squeezed oranges so that his family could have fresh-squeezed juice for breakfast. He squeezed StartFraction 4 over 17 End
    9·2 answers
  • Find the inverse of the equation y=2/3x-6
    10·2 answers
  • What is the answer for X-5(x-1)=x(2x-3) ?
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!