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
sergey [27]
3 years ago
11

Use trigonometric identities to solve tan(2theta)+tan(theta)=0 exactly for 0

Chemistry
1 answer:
hoa [83]3 years ago
4 0
Tan2(∅) ≡ 2tan(∅) / (1 - tan²∅)

Thus,
2tan(∅) / (1 - tan²(∅)) + tan(∅) = 0
2tan(∅) / (1 - tan²(∅)) = -tan(∅)
1 - tan²(∅) = -2
tan²(∅) = 3
∅ = tan⁻¹(√3)
∅ = 4nπ/3
You might be interested in
List the path of the respiratory system
Lena [83]
nasal cavities (or oral cavity) > pharynx > trachea > primary bronchi (right & left) > secondary bronchi > tertiary bronchi > bronchioles > alveoli (site of gas exchange)
3 0
3 years ago
How do you show the formation of an ionic bond using a Lewis dot diagram ?
Luden [163]
An x would represent the gained electrons
A . Would represent the valence electrons
You would just draw [ ] around the diagram
And the charge should be placed outside the brackets
6 0
3 years ago
What is the Ka of a weak acid (HA) if the initial concentration of weak acid is 4.5 x 10-4 M and the pH is 6.87? (pick one)
rewona [7]

Answer:

Ka = 4.04 \times 10^{-11}

Explanation:

Initial concentration of weak acid = 4.5 \times 10^{-4}\ M

pH = 6.87

pH = -log[H^+]

[H^+]=10^{-pH}

[H^+]=10^{-6.87}=1.35 \times 10^{-7}\ M

HA dissociated as:

HA \leftrightharpoons H^+ + A^{-}

(0.00045 - x)    x     x

[HA] at equilibrium = (0.00045 - x) M

x = 1.35 \times 10^{-7}\ M

Ka = \frac{[H^+][A^{-}]}{[HA]}

Ka = \frac{(1.35 \times 10^{-7})^2}{0.00045 - 0.000000135}

0.000000135 <<< 0.00045

Therefore, Ka = \frac{(1.35 \times 10^{-7})^2}{0.00045 } = 4.04 \times 10^{-11}

5 0
3 years ago
By examining electron domain geometry, one can determine that the ammonia molecule (NH3) has
Vitek1552 [10]

Explanation:

2 or 4 does are the most reasonable

3 0
3 years ago
Read 2 more answers
What is the independent and dependent variable
MakcuM [25]
Independent- controlled in a scientific experiment to test the effects                  a dependent is being tested and measured in a scientific experimrent
8 0
3 years ago
Other questions:
  • 3. Give three examples of how microorganisms might demonstrate the characteristics of life
    12·2 answers
  • Choose all of the answers that are correct when describing this atom.
    7·2 answers
  • Why is it important to use the metric system when conducting scientific investigations?
    5·1 answer
  • How many neutrons are present in an atom of element C?
    11·2 answers
  • Hydrogen reacts with 0.771 g of carbon to form 0.90 g of a compound. What is the mass percent of hydrogen in the compound
    5·2 answers
  • The actual yield of a product in a reaction was measured as 1.20 g. If the theoretical yield of the product for the reaction is
    7·1 answer
  • Compare producers and consumers in an ecosystem.
    7·2 answers
  • 1) Which of the following is NOT a step in the scientific method *
    5·2 answers
  • How could you tell what element it is if only a model was present?​
    10·2 answers
  • New questionWhat mass of calcium chloride (CaCl₂) would beproduced from the reaction of 125.9 g of hydrochloriacid (HCI) with ex
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!