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SVEN [57.7K]
3 years ago
12

Sin4θ - sin2θ = _____ 2cos3θcosθ 2cos3θsinθ 2sin3θcosθ 2sin3θsinθ

Mathematics
1 answer:
DIA [1.3K]3 years ago
5 0

Answer:

B.  2cos3θsinθ.

Step-by-step explanation:

Use the identity

sin x - sin y   = 2 [cos(x + y)/2]sin [x - y)/2].

So we have:

sin4θ - sin2θ = 2 cos (4θ+2θ)/2 sin (4θ-2θ)/2

= 2cos3θsinθ.

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Two numbers with a sum of 20 have a greatest common factor of 5. What are the two numbers?
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Answer:

5 and 15

Step-by-step explanation:

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3 years ago
It costs $0.60 per ft² to cover a right triangular field with sod. The side lengths of the field are 300 ft, 400 ft, and 500 ft.
algol [13]
In this triangle, we know base & perpendicular are 300 & 400 'cause 500 is the longest side which is hypotenuse 

Now, Area of a triangle = ab/2 = (300)(400)/2 = 120000/2 = 60000

As cost for 1 ft² = $0.60
cost for 60000 ft² = 60000 * 0.60 = $36000

In short, Your Answer would be Option A

Hope this helps!
8 0
4 years ago
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If a + 38 = 13 and a + b = 5, the value of b is
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Step-by-step explanation:

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3 years ago
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Raul started a plant garden and started collecting lots of soil to grow his plants. His supply of soil grows by 8% per week. If
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3 years ago
Today's cafeteria specials at a high school in Somerville are a deluxe turkey sandwich and a
umka2103 [35]

The cost of turkey sandwiches is $3 and chef salads costs $2.

 Two equations can be derived from this question:

12t + 44s = 124 equation 1

12t + 58s = 152  equation 2

Where:

t = turkey sandwiches

s = chef salads

In order to determine the value of s, the following steps would be taken:

Subtract equation 1 from 2

14s = 28

Divide both sides of the equation by 14

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Substitute for s in equation 1

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12t = 88 = 124

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12t = 36

t = 3

To learn more about simultaneous equations, please check: brainly.com/question/23589883

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