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hram777 [196]
2 years ago
11

How to prove it's an identity sin y + sin 3y + sin 5y + sin 7y = 4 cos y cos 2y sin 4y

Mathematics
1 answer:
Gennadij [26K]2 years ago
7 0

Answer:

0.9777102203

Step-by-step explanation:

the identity is 0.9777102203

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How to solve 2(x − 1) ≤ 12
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Answer:

Step-by-step explanation:

2x - 2 ≤ 12

2x ≤ 14

x ≤ 7

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3 years ago
How many terms are there in the expressions 1 + 2k - j
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Answer:

3 terms

Step-by-step explanation:

A term in mathematics, especially in Algebra, could be a number, a variable, variable together with a number or variables multiplied together as a single whole. Terms are usually separated with either negative or positive sign in an expression.

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The 3 terms are: 1, 2k, j.

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I need help with this question​
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What is the area of the figure below?<br> 3 5/6in 6in
atroni [7]

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Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great !!
ozzi

Answer:

  A)  -2

Step-by-step explanation:

The form is indeterminate at x=0, so L'Hopital's rule applies. The resulting form is also indeterminate at x=0, so a second application is required.

Let f(x) = x·sin(x); g(x) = cos(x) -1

Then f'(x) = sin(x) +x·cos(x), and g'(x) = -sin(x).

We still have f'(0)/g'(0) = 0/0 . . . . . indeterminate.

__

Differentiating numerator and denominator a second time gives ...

  f''(x) = 2cos(x) -sin(x)

  g''(x) = -cos(x)

Then f''(0)/g''(0) = 2/-1 = -2

_____

I like to start by graphing the expression to see if that is informative as to what the limit should be. The graph suggests the limit is -2, as we found.

6 0
3 years ago
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