2 years ago

Please help and explain why, thank you

Mathematics

1 answer:

GalinKa [24]2 years ago

4 0

Answer:

Good morning all friend

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An angle has a reference angle of 40° in the third quadrant what is a positive measure of the angle and a negative measure of th

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Answer:

2, probably

Step-by-step explanation:

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3 years ago

A bag contains 8 green marbles, 5 white marbles, and 2 red marbles.

hodyreva [135]

•in fraction form the answer is 2/15
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3 years ago

Simplify using trigonometric identities<br> 2sinθ - sin2θ cosθ

Anit [1.1K]

Double angle identity for sine:

$\sin(2x) = 2 \sin(x) \cos(x)$

$\implies 2 \sin(\theta) - \sin(2\theta) \cos(\theta) = 2 \sin(\theta) - 2 \sin(\theta) \cos^2(\theta)$

Factorize the left side.

$2 \sin(\theta) - 2 \sin(\theta) \cos^2(\theta) = 2 \sin(\theta) \left(1 - \cos^2(\theta)\right)$

Pythagorean identity:

$\cos^2(x) + \sin^2(x) = 1$

$\implies 2 \sin(\theta) \left(1 - \cos^2(\theta)\right) = 2 \sin^3(\theta)$

so that

$\boxed{2 \sin(\theta) - \sin(2\theta) \cos(\theta) = 2 \sin^3(\theta)}$

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1 year ago

Which of the following could be the side measures of a right triangle?

Lady bird [3.3K]

Answer:

Step-by-step explanation:

Because a^2+b^2=c^2 in a right triangle by Pythagorean's Theorem. So, the only one that works is 3^2+4^2=5^2 because 9+16=25.

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3 years ago

Read 2 more answers

Find the value of x if O is between D & B and DO = 15, OB = 3x + 7, and DB = 9x - 2 x= ____

pishuonlain [190]

Answer:

x = 4

Step-by-step explanation:

DO + OB = DB

15 + 3x + 7 = 9x - 2

3x + 22 = 9x - 2

3x + 24 = 9x

24 = 6x

4 = x

7 0

3 years ago