Trignometry-sin3A

How can I write sinA in terms of sin3A?

Note by Naren Ezhil
3 years ago

No vote yet
1 vote

  Easy Math Editor

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold

- bulleted
- list

  • bulleted
  • list

1. numbered
2. list

  1. numbered
  2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1

paragraph 2

paragraph 1

paragraph 2

[example link](https://brilliant.org)example link
> This is a quote
This is a quote
    # I indented these lines
    # 4 spaces, and now they show
    # up as a code block.

    print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.
2 \times 3 \( 2 \times 3 \)
2^{34} \( 2^{34} \)
a_{i-1} \( a_{i-1} \)
\frac{2}{3} \( \frac{2}{3} \)
\sqrt{2} \( \sqrt{2} \)
\sum_{i=1}^3 \( \sum_{i=1}^3 \)
\sin \theta \( \sin \theta \)
\boxed{123} \( \boxed{123} \)

Comments

Sort by:

Top Newest

I have to find sinA from the equation where no value for sin function is given.Like an equation in variable sinA

Naren Ezhil - 3 years ago

Log in to reply

Hint: State \(\sin(3A) = \sin(2A + A) = \sin(2A) \cos(A) + \cos(A) \sin(2A) \). Use the double angle formula for \(\cos(2A) \) and \(\sin(2A) \) and apply the fundamental identity \(\sin^2(A) + \cos^2(A) = 1 \).

Pi Han Goh - 3 years ago

Log in to reply

What's the big difference if you write \(\sin (3A)\) in terms of \(\sin (A)\) or vice-versa ? All you will be needing is a relation between the two , and it is :

\(\sin (3A) = 3\sin (A) - 4\sin^{3} (A)\)

Azhaghu Roopesh M - 3 years ago

Log in to reply

How was your bits?

Krishna Sharma - 3 years ago

Log in to reply

I got 341 .

Azhaghu Roopesh M - 3 years ago

Log in to reply

×

Problem Loading...

Note Loading...

Set Loading...